I just put a castle SCT 3800 kv system In my sc10.. For around 100$ and love it.. It has plenty of speed and tons of torque.
Great system.
As far as lipos you can get some SMC 5000mah 40c for 27$ a lipo if your going brushless you will want lipos and SMC makes a great budget lipo IMO...
Sometime in March Novak is coming out with a sensored 4 pole system for 120$ called the Hammer looks like a nice system I will be definitely getting one.
The Futuba 3pl is a great radio fits all my needs as is no slouch.. They run about 100$ check out towerhobbies find the coupon codes and you can get some good deals they also have 3 pay if you need it..