Another vote for the Z cars, right up your alley. 240's and 280's are sick awesome fun to drive.
Who knows? You could get incredibly lucky and find an older 300z in that price range...not AS bulletproof, but a wicked car.
Also if you could find a Toyo MR2 that isn't beat to snot, those are trick, and are as go-kart on wheels as you will ever get. the footprint is practically square (corners like it, hahahaha) , and you sit low low low.
And as for the Porche 914, my friend Greg is selling a canary yellow, fully restored one. 14 grand. I know, spendy, but it's a peach.