welcome to the werkz.
When you go to look at the e30, get under it and check suspension. 90% of the time it's the one thing that is not cared for, and poor maintenance is easily visible in the bushings. look for cracks, tears, and pieces missing. also, keep an eye out for rust. east coast cars are terrible for it, because the road crews love thier salt.
as far as clubs go, BMWCCA is the way to go, and most dealerships offer a discount on parts to members, my local dealership knocks 25% off.
R.I.P fast 6
Two wheels or Four, I'm happy as long as the throttle is pinned.