Blimey, £590 sounds awfully expensive mate, could you not find any better quotes? Although I suppose that's the going rate these days perhaps...
I think everybody jumped out of their skins when you mentioned modification,
Mod's are great as long as they're subtle, but some of the stuff you mentioned was just crazy talk,
To me, black alloys, window tints, lowering springs, 'light' mods, induction kit etc, all sound VERY chavvy sorry,
Of course, as you say, it's all about putting a personal touch into your car, but can't you spend money on performance mods such as a remap, sports exhaust, 'possible' induction kit replacement.
You can more than likely hoik the power up by 20BHP+ by spending the money that would have been spent on window tints and alloys on performance mods instead.
These are very sought after cars and chavving them makes them not so sought after.
Sorry to rain on your parade though bud and come across as a bit of an ass, but when I see these posts that could potentially end in a massacred Alfa I just have to step in,
Good luck though mate and get some pictures up when you can!