hello lads

im thinkng of getting a turbo for my rst but dont no what to get , the spec soo far

mongoose 3" bore exhaust
superchip
standard airbox
kent cvh35 cam and pully
proalloy front mounted intercooler
im only running 12psi at the min cos the cars not set up yet (its going in 2weeks to get this done) but what turbo should i get ...was thinking mybe a t3 stage 2 but they are expensive what about getting a cossie turbo ..which one do i use? and what do u reckon ......in the future im gonna do the head ,rods and pistons ..so mybe a turbo to do this as well ...or mybe not cos i migten get around to do this .....