I'm looking at getting into SCCA IT racing next year, and I'm trying to decide which car I should go for. I love the 240z's all around, but they tend to be hard to find in decent shape. The 1st gen RX-7 is an excellent cost and availability to performance value, but I hate its reciprocating ball steering and its just too common IMO. I love the mid engined handling characteristics of the MR2, but they are much harder to work on. Which car would you recommend and what is competitive in its respective class?

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'91 MR2 (project)
'91 MR2 turbo (daily driver)
'85 RX-7 (RIP)
'83 RX-7 (daily driver #2)
'72 240z (project)
'94 Grand Prix (buy-fix-sell)
'85 CRX (RIP)