I've seen quite a couple of BMW's with bent valves, when the belt ripped and pistons hit them. I defenitely do stay away from "timing-belted" cars as well.
For your coolant I recoomend using only MBZ coolant. Its more expensive, but as it has been explained to me worth the money.
MBZ and other European coolants are ph-neutral and supposedly don't attack the plastic parts on the radiator, whereas American coolant is alkaline and will cause corrosion and make plastic parts brittle.
Happy motoring in your new car!
81 300 SD grey/palomino 168K miles
84 190E 2.3 black/grey 64K miles (wrecked)
85 190E 2.3 maroon/palomino 92K miles
88 300E desert red/palomino 204k miles
(made to look like a '94-95)
92 400E desert taupe/creme beige 120K miles
(converted to 94-95 E420 looks)