Tough question, I would be trying to find the money to get the RS6, I'd probably go as far as selling vital parts of my anatomy if it was my decision, however my better half is an accountant and she would say no and I'd go and sulk.
If you CAN afford it then do it, i wouldn't want to be in the position where I was to old to drive and think back and say I wish I had bought that car or this car.
I'll have to wait until they come down in price before I can even attempt to consider one (in about 5years time).
Don't get to drunk and buy it online
Good luck though
Nick
Audi RS4 Avant. MRC Stage 2 Manifold, caf, Map, JCWF Manifold back Exhaust with Sports Cats, H&R spacers, 449ps & 483nm