since nobody has suggested it so far (since thsi place rarely suggests anything FWD or god forbid AWD)...but I'll suggest:
05 Subaru STi (seen as the best year of the STi by most)
Fast, handles well, generally reliable, can be had for $15k or less.
Huge aftermarket suport for all kinds of parts, including track pieces...
With a few mods can hang with 90% of the cars out there in open track, drag, autocross, and you can do rallycross too...and still be comfortable and easy-driving on the street for the long trip to the track or going to work....
Power upgrades are cheap and easy. An extra 50-100whp is just a Cobb Accssport ($500) away and the stock block and turbo is good for 300-350whp.
And when it rains....you dominate....especially autocross courses.
And it's big enough to carry your track tires in the back seat, your cooler, all your gear, and have a buddy riding shotgun to the track to take pictures of you running :)
And in the winter when it snows, you laugh at all the other performance cars sitting snugly in their garages as you cruise by above the speed limit (ok, not on your summer tires though)...
downside: not a vert of course, and STi's didn't come with sunroofs then (IIRC), so you'd want to get an aftermarket one. On he upside, all four windows go down so you can still get the fresh air!
and yes, you can remove the wing
you can run it fairly stock...
or if you want to make it a true track car....(this is an 06-07)