CJ's can be found with V8's, but you'll be hard pressed to find a newer the YJ (87-95) or a TJ (97-) with a V8. The strongest stock engine the TJ comes with is a 4.0L I6, definitely capable enough for any off roading you'd be doing. If you wanted a TJ with a V8, you'd have to do it yourself or find one used that had a V8 dropped in by the previous owner. CJ's and YJ's have leaf spring suspensions, and the TJ has coilspring, giving it a smoother ride, and from what I can tell, better wheel articulation as well. Any of those three are a great choice though, very easily modifiable and rugged enough to take anything you throw at them. Good luck with your decision!!