Astra 1.9cdti 16v
Stick a box on between the ECU and common rail, and enjoy 200bhp
That's ours.
I've just found this one on the net.
http://www.evanshalshaw.com/vehicles...s=false&type=1
a little over your budget £8.5k, but only 28k on the clock, 2007 model, with 150 bhp. Way way way better than the car you've been looking at which is way over priced and sounds like a shed.