Hello everyone, i'm new to this forum and this will be my very first post

I've done a few searches on the forum to try and find the answer first but haven't found any.
I've just bought a mk3 (N reg) 2.0 8v gti (engine code AGG) which needs a replacement gearbox. The problem is, the engine has had a bit of work done to it i,e- Stage 2 head (ported and polished), Kent cams, modified ecu, 57i induction kit, cat back exhaust.
Now whilst i think all of these are brill

, I can see why the original gearbox is broke. I don't imagine it would've been designed for the power the car's now putting out (approx 160bhp)
Can anyone advise of a suitable gearbox to replace it?