Hi Lee,
I have a V3 as well at the mo it's running around the 340ish mark, the mod's I have done so far are full decat 2.5inch, RCM headers (heat wrapped headers, turbo and downpipe), larger fuel pump, NGK plugs, FMIC, K&N induction kit (with cold air feed), apexi fc mapped by the good man Mr F, Getting the Apexi Power FC and a map by Andy is worth the money on it's own, the difference will be like night and day.
Next stage for me will be 400bhp which will involve turbo change, larger injectors, fpr.