With a $120 morlock board you can turn it into a top of the line nice gun. You would also want a better regulator set up. Tribals are also great for cheap hobby guns.
Oh and heres a nice frame if you want to tinker around
http://www.********.com/detail.aspx?ID=1176
Considering dumping my t1 electronics into there but its a bit of a squeeze because the board and solenoid sit in the grip frame rather than on top of it or in a seperate part of the body like on other guns.