Hate to bring some reality to this convo, but i've been a member on the largest e36 forum for 5 years now and have 1st hand experience of the 3.0 & 3.2 ...
1. Daniel - im going to assume your 321bhp was at powerstation. So was mine. Take it with a pince of salt. Their rollers overread horribly.
2. Evo twin vanos does 'fail', ie get noisy/grumble, mostly the rolls royce version though apparently. Some cars are fitted with one made by sachs (mine was), this is more reliable & partly explains why some fail & some dont - its luck of the drawer as to which one you get tbh.
3. Most people dont realise, but 3.0s also have a vanos system, but its single vanos instead of twin and far more reliable. If it does break, its pennies from a breakers to replace, not £500 + shipping/fitting from Dr Vanos in the US.
4. 3.0s nearly always make their book power at rr days, evos dont.
5. Evo gearboxs are weaker & SMG is horribly unreliable. The 5 speeder is a much nicer box as well tbh.
6. Evos have a quicker steering rack, which makes for easier correction of the oversteer that usually occurs on exciteable driving.
7. 3.0s are more snappy on the limit, this can be countered by fitting the staggered set up from the 3.2, ie 7.5" wide front, 8.5" rear. It is 7.5" all round on the 3.0 as standard.
Me. Money no object & cash in bank for a rainy day, Evo. As a viable ownership proposition 3.0. I've looked at a few cheapies now though, & most of them i wouldnt let my parents dog sleep in, let alone drive it anywhere ....