kells - if your starting with a 225 TT engine then your laughing cost wise as its already built to take a fair bit more power than it has, might be worth going stand alone management with a switchable map (although this does add £Â£Ã‚£ to the cost I suppose) that way you could have something a bit more drivable and less demanding of the cars weaker parts etc then just flip a switch and go into booost mode!!!!
there is a guy on clubgti that has a black mk3 and he is DIY'ing a 20VT in it but keeping it almost totally standard apart from some anni wheels you should check it out
yes i have looked at the standalone management, id be looking at a extra £1k on top tho thats the only prob..but in ideal world it would be the way to go for sure

the car you mention sounds exactly like what im gonna be doing to mine

(minus the annie wheels as i dont like them at all) i will need some rims tho to go over the brakes..