There's always too many options aren't there?
Options 1&2 I honestly don't know the cost involved because I have never done either completely. I only estimated the cost based on what I know of the price for certain parts and labor cost. Option 3 is the one that I did and I do know the cost involved.
1. Keep your current housings and upgrade the axle shafts, carriers (to accept heavier duty shafts), change your gears and strengthen the front housing. This is a shot in the dark but I'd be willing to bet that you'd be somewhere around $4k all in for parts and labor.
2. Go for the 60/14 bolt option (assuming used) cost of axles, rework the axles to make sure they are good throughout, modify them to fit your Jeep, fabricate mounts for your Jeep, transfer/adapt what can be and quite possible buy a new set of wheels (unless your stock hubs will transfer). Another shot in the dark, but maybe between 4$K and $6K.
3. Go for the new aftermarket option. Built as you want them and comes with a warranty. Looking at between $8K and $10K depending on how they are set up and you may have to buy new wheels.
I went with a Dynatrac ProRock 60 rear and ProRock 44 front with RCV axle shafts on mine and was in at (edit) $12,300 for parts ($3,800 for D44, $4,300 for D60, $1,000 for F/R drive shafts, $570 for big brake kit, $1,100 for RCV shafts, $160 for gear oil and $485 for various delivery charges).
Two reasons I didn't go with a 60 up front:
1. The 60 front has a larger hub and I would have had to buy new wheels to make it work.
2. The front axle doesn't really take as much abuse overall as the rear and the ProRock 44 addressed and beefed up those items (axle tubes, C's, ball joints, etc.) that are known to be points of failure on stock 44's.
If you've got the funds I would go with the Rock Jocks.