You guys who are racers out there are saying 'Come race with us. Spend more and get the better gear so you'll be more competitive', thats only if the guy has already tried it for some time and raced a few races and feel like improving on that with a better car and equipment. So many I have seen bought the high-end stuff only to get burned because it was more than they bargained for in the beginning. Perhaps you are looking to set people up for a fall and pick-up on their "getting out of the hobby" sale.
That Aint Right!
(Well hopefully you guys are not really having bad intentions
Putting it short, the first posted reply is correct. However, of the three here are my comments:
NTC3 - Popular car but rather fragile parts and crude design.
RS4-3 - Popular car better than NTC3, drivetrain can't take Hi-perf. engine upgrade without overhauling the drive components.
FW-05T - Similar in design to RS4-3, very durable. Parts avail. throughout Net.
1/8 buggy - too many to choose out there, go with OFNA Ultra LX Comp. about $250 or less and lots of parts support.
What ever you do, don't spend anymore than $300!! Just buy it, try it and have fun. If you don't like it you can always dump it for $150 or so and you won't be loosing your life savings on it. If you like it, choose to upgrade it or replace it with something better. Upgrading is better because you'll get more use out of your original investment, but sometimes its better to renew on a clean slate. (hence what I already said)
There are others that are even cheaper like Himoto
which you can get for less than $200 RTR. But you may want to ask around about those. Pictures on those cars look like Kyosho knock-offs. Nothing wrong with that if it can save you money like for upgrades or your next car or your next hobby...