or Voodoo cells.
I agree with Richard there, its more the driver than anything else. Obviously within reason, dont spend £20 on a second hand Tamiya Frog, with a nicd battery pack and expect to be running at the top of your club, likewise, dont spend ££££'s on the top charger's, batteries, cars e.t.c, as if you're not up to the spec of the car, or cant set it up, its worthless.
Work your way up. start with a 'team' style spec, that way you get the optimum balance between performance, strength, and value.
and dont forget, as I have over the past few years, you are doing this for fun, its a hobby, not the end of the world when you have 'peaked' in performance, and on a slippery slope to the crap finals again