There are a handfull of 3 door Novas on Ebay for cheap.
I had a tweaked 1.5 Turbo Diesel,it was good for 130mph down hill on the clock,driven steady returned 55+ to the gallon.
SRi Vectra discs and calipers fit if you put 14 inch wheels on,mine would do stoppies and Michelin energy tyres squealed in the wet,they had that much grip.Superb little car,i was gutted when some scroat got past the security and nicked it