As others here have said already, it's all about quality not quantity.
Mike S, I think you're doing absolutely the right thing even though it feels a bit painful right now. It's easy to get attached to delicious cars like an SL65, Noble M400, Audi RS4 and a Cayenne Turbo.
BUT, I would gladly part with these for a LP640. I can't remember just what cars you'll have left (man, you have too many to keep count of
).
But if memory serves me correctly, you already have a F430, 997S so all you need to complete the set is a Lambo.
Many, many congrats man. After you've driven the LP640, I'll bet you'll feel no regrets at all and you'll question yourself why you felt so emotionally cut up over the change in the days before you took the plunge.
Just please, take lots of pics so us daydreamers can enjoy your pleasure by proxy!
Enjoy this weekend - it's not going to be a sad one at all!