And when you get into WJ knuckle swaps and etc you will lose that, even with the spacer welded on, personally I would rather have the extra clearance just incase something did happen: for instance without properly BS'd wheels running OTK you barely clear (if at all, depending on which set up you run), if you're on the trail and you bend or brake your tie rod, that 15" wheel is going to eat it if you don't react correctly.
You're right though, I wouldn't make 16" wheels (or larger) a priority at the moment if I was him, though it wouldn't hurt to look into ordering them one at a time or so and building them up for the proper set up while still maintaining the best money spent:usefulness ratio.
'00 TJ 2" on 33" Grabbers
'00 XJ 6.5" on 35" KM2s
'96 ZJ 2" on 31" Baja Claws
'93 ZJ - Stock, Totaled