Thanks for all the helpful advice. Sadly, cash is tight at the moment, as I've got to get a new cambelt for my car before the old one snaps (imminently I'm told) and the engine destroys itself. I can't do the work myself as it's so complicated - locking all the engine parts in place - and the garages charge a fortune!
As for 'rich girlfriend', the reason I'm considering an upgrade is because the gf wants to order lots of bits to build her own computer for work, so I was going to freeload on the postage costs! Besides, if I'm upgrading in order to play more SH3, I can't see her being very chuffed - no chance of her paying - she already thinks I spend too much time 'ignoring' her.
Curse (but not really!) GWX and its effect on my social life!