Yeah, go for an M5 Tito.

E34s are affordable, very rare and an absolute blast to drive. Nothing else like them. No warranty, sure, but they are a tad cheaper.

E39s are pretty damn cool too, also getting to be pretty affordable, although they're more commonplace than E34s.

We can be M5 assbuddies!

Or perhaps go for either an E34 or E39 540/6speed