I bought an '88 300SEL for my 16 year old. Nice big luxury sedan with an underpowered (but not slow) motor. It has decent acceleration because they cranked up the rearend, but he's not going to want to race anybody. He actually picked the body style and I found the car. I've had it for about 3 months now and I've gotten very familiar with the M103 engine. There seem to be a LOT of people in this forum with that engine, so information is plentiful.
Driver airbag too.
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino