Thinking of an E36 M3 - advice needed

[Duke Thrust]

Hello all,

Complete BMW noob here so please forgive any silly questions.

I'm thinking of replacing my Golf daily driver with an E36 M3 - I do a reasonable mileage each day and I'm getting quite bored with the old girl and fancy something different.

So, questions then:
- What things should I be looking out for with and prospective purchases?
- I notice that a lot seem to have high mileages (over 100k) which I take to be a good sign of the robustness of the engine design, but how much is too much? Have seen a few with up to 200k on the clock!! Currently thinking about buying around the 100,000 mile mark and put another 50k on it - realistic or sheer folly?
- Are there any upgrades considered to be 'a must'?

Thanks for your help in advance chaps

[Duke Thrust]

Thanks for your replies chaps, can you suggest a decent place to look for 'for sales' (other than autotrader, got my eye on it already)