Your girlfriend will be fine. Buy what you like as long as the money your using isn;t the money from your joint holiday saving account. If the money doesn't effect her then she is really just annoyed your not spending the money on her, but when do they spend that much on you eh?
my Girlfriend is the same with my car and computer, bit of a nerd love new hardware she gets mad. Tip only tell them what you've done when there is nothing they/you can do about to change what you have bought.
Also nice looking car, if you getting running should make your money back easy.
Good Luck
Buzz
P.S.
book a dinner and buy flowers
