AV.NINE does have a point - an inexpensive, efficent, reliable (Jeeps are none of these) daily driver that leaves money over for working on the Cherokee would be a smart choice.
Then again, I really like my '08 JK. If you do decide to get a JK, here's what I would suggest:
If you wheel frequently, and want a capable rig but know that you're not going to want anything bigger than 35's then a Rubicon is probably a good choice. You can't mod a base model JK to be as capable as a Rubi without spending at least as much money as the Rubi would cost.
If you wheel a LOT, and know that you're going to want something bigger than 35's, then buy the base model and stick some serious aftermarket parts in there.
If you don't wheel all that often, and aren't going to go bigger than 33's, can you justify shelling out for a gee-whiz transfer case, a Dana 44 in the front, and lockers? I couldn't justify the expense if I didn't wheel a fair amount.
As far as the "new" interior, I haven't seen them in person - but the pics look cool. More Grand Cherokee than Wrangler - but that's kinda nice on a DD. I don't know what to tell you about the pentastar...it'll probably be quite a bit better than the current 3.8...but you may be holding your breath for a while. Running with the 3.8 does suck a little bit, but it isn't the end of the world. You just have to understand that while you have a touch more HP than the 4.0, it is available in a completely different part of the rev range.