If you're looking into buggies, you'll be contending with the 1/8th scale cars. You can get those in the Kit or the RTR form.
These aren't exactly models...they're a little more indepth than that!
as you will soon figure out if you decide to build one. I personally havn't built an 1/8th scale buggy yet, but among my other cars, it takes 6-8 hours to build it.....8+ hours for a really good job. I usually try and pace myself and do the fine detail stuff....it could easily take a few days to finish it.
If you just follow the directions as they read and look at the pictures closely, pretty much every kit is idiot proff. Especially if you go with LOSI or AE manuals, a freakin baby could put those together!
The benefit to a kit is that you already have the know-how on how to fix it when it breaks. If it is an RTR, you may have more difficult time repairing the car.
Unfortunitally, you can't get into much anything with 200 dollars. If you want 1/8th scale....kit, you're looking at easily $1000+....the RTR would be much cheaper, but cheaper in the radio equipment, engine parts....etc. an RTR would still be in the 500 range.
If you're starting from scratch and want a kit, for most any car, you'll be looking at around roughly $850 and up. You can get a very basic RTR electric car for probably 200.
For 200 bucks, you're looking at http://www2.towerhobbies.com/cgi-bin...=LXVK74**&P=ML
for a kit, you're looking more along the lines of these http://www.teamlosi.com/kits/index.htm
Don't forget, a kit is just the rolling chassis....you still need to purchase the radio equipment, electronics, motors, batteries/gas, servos ect....
Sorry if this puts a damper on your interest in the hobby. Let us know if you have any more questions! Good Luck!!