2.3-16 . . . twin cam, most have 5-speed manual and limited slip diff, leather sport seating and a, appropriate for it's age, body kit. The downside is the maintenance costs, particularly with the model specific parts for the motor and SLS rear suspension. Add to that, it seems that most "used" 16 valves truly were "used" by previous owners (usually the second or third) that didn't want to deal with the cost of maintenance of these cars.

2.6L . . . smooth six, just slightly less HP but wider power band, typically with a 4 speed auto trans, but there are a few 5-speeds out there. Feels like a much bigger car than it appears from the outside.

With enough $ there's pretty much no limit to the mods to the car, there are even some former DTM 190Es for sale in Florida. In addtion to turbos, supercharges and Mercedes motor swaps, a twin turbo Supra engine will go in there.