Thanks for the responses guys. It's been interesting seeing how our lists differ.
After some thought, here's my list:
'06 Pagani Zonda F Clubsport
Colours: Ehh, I can never come to a final descision when choosing a colour for the Zonda. Silver, blue, white and unpainted carbon fibre are all possible choices for me, but at the monent I'll go with dark metallic red w/beige leather interior.
This choice is set in concrete. Never rotates, never changes.
'07 Porsche 997 GT3
Colours: Carrara White w/black leather interior
PCCB, Sports Chrono PKG, Luxury seats
Though I had a thought to include the Wiesmann MF4 GT, I eventually decided on choosing the GT3 as I just could not resist. Fantastic car, both inside and out. The GT3RS was also a consideration, but I think the standard unit is hardcore enough...
'07 Lexus LS460
Colour: Mecury Metallic w/black interior
Preminum Pkg
Ok, I must to admit to having second thoughts as to choosing the LS. Yesterday I got the opportunity to see a silver Avantgarde C300 (my second sighting of the new C-Class) and absolutely loved it. And that being said, I just about went with a C63 AMG, but felt too guilty leaving the LS460 out (lol). Love it too much.
The IS-F was also a consideration for me, but having yet had the chance to see it in the flesh, nor having heard any driving impressions whatsoever, I felt It had to be left out.
'07 Mercedes-Benz CL63 AMG
Colours: Pewter Metallic w/black interior
Solid, well built, beautiful, powerful; the Perfect GT.
'01 BMW Z8
Colours: Silver w/red & black interior
After some serious thought into what my 5th car should be, I have came to conclusion that the BMW Z8 is just about perfect. The 993 Turbo was always a favourite of mine, but considering I already have a GT3, it seems pointless to have two 911's. Additionally, I put thought into either an SUV or a small yet fun and cheap car, but couldn't come to a solid decision. Not only is an SUV is a little too big for me, but I question whether I'd actually use it. Had thought about a Civic Type-R or maybe an S3, but in the end the Z8 seems to be my best bet. Not only is it beautiful, exclusive and fast, but a it's drop top (something obviously lacking above).