depends what you are looking for really. miatas are ok i suppose, but im about 6'2" and i fit better in a first gen MR2 than i do in a miata. they are pretty played out, imho, and theres cars with more room that are just as fast. wrx is ok, but also very played out.
i tend to like a lil older cars myself, so if i had the cash and wanted a rwd i would likely go with a toyota supra turbo, and if i wanted something small like a miata i would go with a second gen MR2 turbo. If i was to look for awd, i might look for a 1st gen celica alltrac, eclipse/talon awd turbo, etc. then theres always the class of things that i see in that range that are swapped or properly modified; im always looking out for things like the starion/conquest, 323gtx, etc. things like older subaru wagons with new wrx implants, corollas with s/c or 20v swaps, and the likes. i also like sleepers though.
but i would say toyota, i have seen some very nice supras and mr2's in that price range that are very quick and reliable. the second gen supra and the second gen mr2 both look great also, imho.