Actually new springs aren't expensive. It's the labor installing them that cost the bucks, but even that's not to bad. $500 labor at local tire store here, plus alignment.
The softest lift springs you can get that work well on LJ are Rancho 2.5", which are really 3", IMO. Rancho are available in various spring rates. Get the 130 lbs/in front and 150 lbs/in rear. I had those on my LJ and they worked great with steel skidplates, aftermarket bumpers, but no winch. When I later added a winch, I had to also add a 3/4" poly coil spacer to get back some height in front.
Now if you plan to use a winch in front (with aftermarket bumpers and skidplates) then I suggest an OME Heavy Load TJ front spring. It's 140 lbs/in spring rate. Without a winch it sits 3" high in front, with a winch it sits 2.5" high in front.
(The OME TJ front light load spring is also 140 lbs/in, but it a shorter spring. So same spring rate, but less lift)
I don't think you'd want a heavier rear spring than the Rancho 150 lbs/in, but if you do, get the OME TJ rear medium load spring is 160 lbs/in and it a 3" spring.
For comparison: Stock TJ non Rubicon spring rates are (typically) 130 lbs front, 150 lbs rear. Stock Rubicon TJ springs are 140 lbs/in front, 160 lbs/in rear.
How do I know this stuff? I owned an LJ and I tried all those springs and all the other measures I mentioned and got a good ride at a 3" lift height.
Now here is a fact you might not like to hear, there are no soft springs available above 3" lift height. That's because when single rate spring is taller than 3" lift, it must have a stiffer spring rate to keep the spring and Jeep stable.
However, AEV, and some other company I forgot the name of, do make dual rate springs that offer more than 3" of lift. I forgot how much lift, but I think 4, 5, and or 6" of lift, and they offer a decently soft ride compared to cheap tall springs, but nothing will ride as nice as the Rancho 2.5" (really 3") that I mentioned. The OME come close and are almost as soft as the Rancho. But to get those softer rides, your lift height is 3" front and rear without a winch, or 2.5" front, 3" rear (though you can always add a 3/4" coil spacer if you have a winch to get front back to 3").
If lifted above 3" ride quality will be stiffer-firmer, even with fancy dual rate springs from AEV or any brand of dual rate springs. But the dual rate springs that are above 4" won't be as miserable as with single rate springs.
Rancho single rate springs are cheap (and excellent), but only offer 2.5" to 3" front, and 3" rear. (Though Rancho calls them 2.5" springs).
OME's springs are not cheap, but are not to expensive. They are excellent for 2.5" to 3" front, and 3" rear, if you choose the ones with appropriate spring rates.
AEV's Nth Degree Dual Rate springs are expensive, but are the best way I know of to get a somewhat tolerable ride front a lift taller than 3".
So your options for good riding springs are Rancho or OME, but your lift will be 3", which means you'll need to run 33" tires. Ideally some narrow 33s and some wide fender flares (good combo for clearance), or run some 32s, even then ideally run narrower 32s. By narrower I mean 10.5 ideally. Nothing wrong with narrow tires though. They are great, but you'd need 7" or 8" wide wheels for them. I prefer a 8" wide wheel for a 10.5" wide tire.
If you want to stay lifted high enough to run 35" tires, then get AEV's Nth Degree springs. They'll ride softer and better than whatever you have now, but they won't ride anywhere near as nice as the Rancho or OME springs I recommended.
Change of priorities here:
I suggest you make these decisions BEFORE buying shocks. Then you'll know what length shocks to buy. Regardless of what lift height and springs, I suggest RS9000XL adjustable shocks, or maybe those Fox shocks that Savvy sells, but talk to Savvy for some advice before buying the Fox (to make sure they really do serve your needs). I know the Rancho RS9000XL would serve your needs.
P.S. - I haven't tried AEV Nth Degree springs nor Savvy's Fox shocks, but I know them by reputation to be good. The only question is whether they are what you need. Possibly they are.
I have tried the Rancho springs I mentioned on my LJ, and also the OME springs too. I liked them both. Of the two, the Rancho are slightly
softer. Both are excellent quality springs, and the Rancho are also a bargain price. I don't remember the part numbers for the softer Rancho springs I mentioned, so you'll have to figure that out, possibly call Rancho. Be careful to get the spring rates I mentioned whether you get Rancho or OME springs. Both brands make some terribly high spring rate choices that would ride really harsh, which you don't want. Also, don't let some technician talk you in to a firmer Rancho or OME spring than I recommended. I have a bad back and appreciate a soft ride, and I tried those soft springs on my LJ and they were very good. I also used the Rancho RS9000XL shocks and OME shocks. The Rancho RS9000XL shocks ride much softer than OME shocks. Since the RS9000XL are adjustable, you can set them at the firmness or softness of your choice, and they can be readjusted later if you add or remove a winch. Just make sure you get the right length shock for your lift height. That or try the Savvy Fox shocks.
I also did all the other things I suggested in my earlier post, and each thing helps. The combination gives a good ride. Don't under estimate how much a Currie Anti-Rock adjusted to a softer setting helps ride quality. It's a huge improvement.