hi rab mate..
i had a nice black non evo e36 which is the ealeir 3.0 litre car.
go for a last of the line evo and defo non smg as the gear change is so slow!
excellent cars and very reliable but one thing to check is the exhaust... prone to rusting as they are getting on a bit and a replacement from bmw is close to 2k...
the vanos does go sometimes, think it shows itself up with a dodgy idle? but not sure....
i had my at and indicated 165 on the speedo a few times
check for un even tyre wear and tired suspension/bushes on cars over 80k.
can be expensive to run but no more than the cossie.
try to get one with as much optional extras as you can as they are plus point when you come to sell it on.
could go on for ages but there are loads of buying guides on the net.
try munich legends or a specialst like that for a good car!
the GT spoiler is a must!!!