6000k HIDs - good choice mate, got them on mine, very bright with a nice slight blue tint.
I've spent so far on mods:
Angel eyes and HIDs - £90
Forge 007p - £60
Green cotton open cone filter - £30
Two replacement 19" RS4 alloys - £90
So a total of £270
But that's all about to change in the new year. First two plans are
Cat back custom exhaust system done by a good friend of mine who's handy at welding - £250
Selling the 19s and buying 17 inch black/polished silver alloys with new tyres - £200
10mm spacers - £20
Custom aluminium induction which I'm doing myself with ali pipe and relocating the battery - £25
So that's £495 right there
Then after that further into 2009 I want to get it:
Lowered (springs and shocks) - ~£150
Decat - £80
Spoiler - £70
LCR front bumper - who knows
Paint - £30
LCR splitter - £20
Rear neuspeed ARB - ~£120
Upper front strut brace - £50
And finally a remap to set it alllll off
Expensive business but '09 is planned to be immense.