THe SDi is definately worth a miss, 65Bhp N/a Diesel, 0-60 of 17.3secs, so i think best left alone.
Next up is the 100Bhp PD Turbo diesel. 0-60 in 11.3secs and quite punchy.
Next up and not available since 2002, is the 115BHp PD 0-60 is around 10 secs and again punchy.
Next up is the 130 Gt TDi, 0-60 is 8.5secs and top end of 127,
Then finally the 150 PD 0-60 is 7.9 and top end of 134.
The 150 is the best on paper, but considering its gonna cost you 3grand more than a 130, then i would go for the 130. Plus you can chip it to just over 165 for 500 quid.
?12000 will get you a reasonable 130PD but i would spend a little more to get a very low milge as late as possible model.
The choice is yours.