I know been poking around looking for any katrina mini's that might turn into a long term project that eventually replaces the 87 golf.
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Don't discount any ex-National SSC cars, either.. At least they've already got part of an IT cage, usually have a bunch of wheels and tires, and have a logbook (and you may even be able to sell bits of the interior). Teams that just have to stay current sometimes let their old racecars go for relatively short money.

My ITA Z3 started life as an SSB car and became an IT car for less than it would have cost me if I started with a shell..

-noam