Yeah i have been looking through the for sale stuff you mentioned earlier. I think I have a good idea of what I should be looking for now

Thanks to everyone who was helpful and understanding of someone new to the sport and just trying to learn..

Im going to look for some 15's I like

If you're interested in 195-205 rubber, then it's Heliums or Enkei's.
If you're interested in 215+ rubber, it's 6UL's... end of wheel homework.

I just sold some Heliums for $250 a couple weeks ago. Even the cheapest decent 195's are gonna be in the $450 range installed.

6UL's used don't typically sell for much less than they are new, and bigger rubber is more expensive. Plan on $1k for 6UL's and 225's.

Plan on another $450-$500 every 15k-25k miles for new tires unless you're an idiot and buy some all-season rocks.

Stick with Toyo/Hankook/Falken and be happy.

I love 15 inch rims on a miata not to big and not to small. Just keep a eye on the weight of the rims I have been told to try to stay under 30 pounds per wheel and tire or it will handle like shit.