RWD, Manual, Cheap, Easy to Fix...well, you didn't say if you care about being competitive or just want to have fun and goof around. I'll assume you also want to be competitive, or at least somewhat. So here's my list:
The usual suspects (arguably from cheapest to most $$ though it varies). Note that my opinions on the cars are either firsthand or secondhand, having done this for 6-7 years now and having raced against friends who have all of them for much of that time. YMMV, of course. These are my perceptions.
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Volvo 240 (cheap, very strong, easy to work on, easy to find junkyard parts, ok aftermarket, and can be fairly competitive). Can haul all your gear in the car with ease, plus a couple buddies. Fairly easy to find M/T.
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BMW e30 (cheapish especially if you do an early 318 or ETA, very strong, easy to work on, fairly easy to find junkyard parts, huge aftermarket, very competitive with minimal modss). Can haul all your gear and wheels basically just in the trunk....very easy to find M/T
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BMW e36 (cheap, especially 318 non-Ti models, fairly strong (though they need reinforcement in a few key places to hold up well, junkyard parts easy to find, big aftermarket, very competitive with minimal mods). Can haul all your gear, wheels, etc in the car with ease. Very easy to find M/T
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RX7 (either generation). Pretty cheap, fairly strong, junkyard parts not bad, decent aftermarket, and can be very compeititive with minimal mods (especially FC). Easy to carry all your tires and gear. Downside of course is rotary, unless you like rotary, in which case that's an upside!
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Miata (not quite as cheap with hardtop in most cases, but still pretty cheap, pretty strong, jy parts fairly available, huge aftermarket, very competitive with minimal mods). Not for tall people. Hard to haul your wheels and gear in some cases, especially if there's two of you going. M/T easy.
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MR2. Probably the least cheap in good running condition at this point (2nd gen), 1st gen cheaper. Not quite as strong (from what I've seen, but YMMV), jy parts not easy to come by, decent aftermarket. Hauling your tires and gear in the car itself is a major issue. 2nd gen can be very competitive with minimal mods. 1st gen less so, but still decent. Comes in M/T..
Now, if you don't care about being competitive, all kinds of random stuff opens up (i.e. Mustang, T-Bird, Crown Vic, 1st gen Supra/Celica, XR4Ti, and the list goes on. Most of the American RWD stuff certainly is pretty stout, huge junkyard parts availability, cheap as dirt to buy-in. Most of them will not be competitive in anywhere near stock setup.
Small pickups (Mighty Max, B2300, etc) - cheap, fun, easy to haul all your gear, kind-of competitive with minimal modding (but not really, usually)...
YMMV on all that, of course. But look at the large regions and nationals in all RWD classes and pretty much all the top half of the competition field are driving one of those cars. There's not a ton of mystery to it unless you want to spend more (like BRZ or something) or are going to heavily modify it (in which case all bets are off).....
For AWD....just get an old Impreza or Forester as the easy button and call it a day. Running a Subaru will probably cost more in the long run than most RWD cars. And you can be competitive if you're a good driver perhaps, though you have to run against GC 2.5s, WRXs, etc...soooooo. There is that.