Help! I'm a Girl and Know Nothing About r/c!!

[the.wert]

Ok, here's the deal. I have a revo chassis, and I'm going electric, more specifically , brushless. i have about $500 for the conversion, so the cheaper the better, but i want to be able to upgrade my motor to a Neu later on, apparently it and the mamba max don't play well :(
what do you recommend instead? might use the tekno conversion kit, because i don't want to use an emaxx tranny, and cut the chassis, all that stuff. Do they make bash-worthy li-po's now?

so so far what i need is
Feigao 540 9L
Tekno conversion kit
ECU of some sort
Battery and charger
that it?

Also one last thing, I keep hearing you guys talking about 'gearing' not sure what you mean, do you mean the spur gear, or inside the tranny? (sounds complicated)

the main thing i want is a e-revo that can keep up with the nitro's and have a long enough run time.