Any year DOHC and SOHC 3000GT/Stealth Non-Turbo will give you years of reliable driving. The 3.0L SOHC (Found in many older Chrysler cars as well) has been around for ages and the DOHC is good too..

Nothing really goes wrong with the Twin Turbo units EXCEPT for the Getrag transmission. Synchros (2nd gear) and the output shaft (rusting) problems are common.. It use to be a $4,000 affair but within the past couple years, a place in California has been manufacturing internal tranny parts and rebuilding cheap so its a lot more inexpensive now.

Parts a lot cheaper then for a SVX, but it is harder to do work in the engine bay.

I've owned 3 of these cars and they were great! (Only problem, the R/T TT where I had to replace the output shaft)