Where do you look online for cars? Also, what car.

Been a minute since I've been around here. I need the collective wisdom of GRM's pulsating brain.

Background - been racing a Radical SR3 in the Radical Cup for a year or so, as well as taking it to test days and HPDEs and such. I've recently had a baby and some other financial and health changes and I am probably going to sell the Radical - I still want to stay involved with motorsports but would like something that's a bit less wallet-shredding.

First question is - where do you guys source cars that have already been prepped? I have no problems building something out myself, but I am thinking that buying something that is ready to go will be the more economical choice . I've looked at Racing Junk and poked around a bit on CL - are there other sites out there that I'm missing?

Second question, and the fun one -  suggestions for what to get? I am 6'4" and pudgy so Miata is Not The Answer in this case. I am looking at C5 Z06s, E36/E46 M3s, and Mustangs at the moment. Price is flexible depending on my spouse's mood, but let's say $20k is a reasonable price. Goals are similarly flexible - I might wind up messing around a bit in NASA ST-whatever, or possibly just tootling around in an HPDE.

I figure the second question might be beating a dead horse so apologies in advance.

EDIT: I have a F-250 for towing and I live in the sticks so I have space for a trailer, so not-road-legal is fine.

If you don't care if it's street legal, maybe poke around racing junk for a race car that's fully prepped but not competitive anymore?

Used race cars are cheap, but they're cheap for a reason.  They've been used hard, and you often wind up having to fix many of the things that the previous owner did wrong, so the purchase price is just the beginning.

BMWs have good interior space for drivers, but I don't think a $20K budget is going to deliver a satisfactory E46 M3 race car.  E36 perhaps.  Maybe Spec E46?

Yeah, looking at race cars and I'm coming to the conclusion that 20k will be a stretch for anything that is both fun and not beat to E36 M3.  Leaning more towards a C6 Corvette and just tarting it up myself over time.

I'd stay decide if you want to race, TT, HPDE, etc. If I wanted to compete in any way, I'd definitely want to pick a car/class that has competition where you'll be racing and also the car itself will be competitive in that class. 

That's where I'd start.