Eh, it'll need a few thousand to get it ready based on the description in the OP.
It'd probably be advised, at the rate he hits the track, to upgrade with an Oil Cooler and BBK at a bare minimum. So that's maybe $3k-ish on top of the $10k price.
BBK just because of the frequency he tracks:
http://www.ft86club.com/forums/showthread.php?t=94608
CSG has a kit that's supposedly even cheaper on consumables
Depending on what tire OP decides to use he'll probably be looking at coilovers to handle the grip, the 235# RCE springs probably won't cut it for a <201TW tire bigger than stock, I'd guess $2k ballpark.
It already comes with header and OFT but if you go FI you're up to $20k all in.
It makes more sense as 'upgrading the miata' instead of 'downgrading the corvette'
And with consumables being the primary factor, I'd take the 86 over the E36, it's already in your sights and if the power is lacking bolt on a blower and call it a day.