i just bought a rustler and i would like to up grade what motor is good

Any good stock motor will be great for you. I personally recommend a
P2K because they aren't as sensitive to gearing as some other stock motors are.
What version of the Rustler did you get? The new one with the 12 turn motor in it?
or an older version?

i got an older one its got a titan 12t550 i just need a little more power to beet the guy on my track lol