Depends. You're gonna wanna stick with the electro route, and you could always go with a Bushy or an Imp. Or a used e-cocker from e-bay or the nation, or you could find a used trix for about that much on the nation as well. If you really wanna get into it, you could buy a TMC LE Trix from
www.thematrixcenter.com but it's gonna cost around $825.
Just remember, almost anything outside of Piranhas, Spyders, or Tippmanns are gonna require nitro, and I don't know if you have nitro.