If you want something Rubicon capable, and have unlimited funding/time, get a mid 90's pre OBD2 4.0 Cherokee.

If you want strength and reliability to run 35's without breaking, you will be replacing all the axles and driveshaft. 35" tires are the limit for the dana 30 and chrys. 8.25 axle, I don't think a dana 30 can be considered rugged and reliable with 35s. If you were to get a dana 35 rear end, you'd be limited to 33" tires.

Also if you want to crawl nice and slow and still be able to drive on the street you will probably want a 4:1 transfer case. Atlas would be my #1 choice, but you could get the 4:1 kit for a 231 or just get the Rubicon 241 case.

As mentioned above you will also need some type of frame strengtheners or you will have a twisted jeep after a long hard run.

Since you will be replacing so many parts and modifying the uni-body, just get a low cost jeep with a good engine and transmission and not too much rust.