Yo
best bet is to look around on Autotrader mate, GT TDI's stil lhold a price premium over petrol. Few months ago I sold my silver 3 door GT TDI 110 1998 for £3600 and bought a 2000 1.8T for Just a little bit more.
130 could be possible but with alot of miles. Could get a PD 115 (6 speed) a have it remapped to 150BHP?
Tim