Don't discount the RX8. Chassis is BRILLIANT. Engine is a work of art ( don't listen to the internet stories they're half truths spread by idiots ) And they have suicide doors !? And I've got a nice caged one for sale ;-)
You'd be surprised, cheaper than e36s now ! This is mine for sale, only marginally above your budget and it's got a BDC spec cage, seats, harnesses and modified hubs ! http://www.driftworks.com/forum/drift-cars-sale/249889-testing-water-driftcup-ready-caged-rx8.html