The Deadbolt is a more capable ceawler out of the box. But if you get the C10, prepare to hack up the body, especially in front of the front tires, because even with the stock puny tires, they rub.
The RC4WD 1.0 Mudslingers are probably some of the best tires for these trucks, but they will require a lot of body trimming on the C10, and about 1/8" around the top and 1/4" out of the rear of the front fenders on the Deadbolt if you get that one.
The RC4WD stamped steel wheels are great for the money, plus you can flip the wheel and get a bit of offset for a wider track. But you really should upgrade the servo to the Emax or Powerhobby metal geared servo first, because widening the track width creates a lot of scrub steer, which is what happens when the front tires are drug in an arc as you steer.
The motor on these trucks is a bit weak, and they may wear out quickly. A good upgraded motor is the PN Racing motor sold by Kenon Hobby. But you will need the motor mount and gearset. Buy them in a combo for a few dollars off for like $58 think.
Furitek also has some killer ESC's and a brushless motor for these trucks.
Other than that, just add weight down low. Brass wheel hubs, diff covers, etc will help.
littleguyracingparts.com and moforc.com have some cool parts for these little trucks.
Any other questions, just ask. There are a few guys here with these trucks, so you came to the right place!