Lots. lol. Too much.
I've just sold my white 3G on here, tonight actually.
That's going towards an LED Cinema Screen for my MBP. I have a 27" iMac for office use and find using the MBP a little hard, when coming off the desktop.
My MBP is bumped up a little from stock, since I need the extra power for graphic design/web/video/manipulation etc.
2.8Ghz.
8GB RAM
500GB HDD @ 7200
Two graphics card model.
I bought a 1TB Time Capsule, iWork and AppleCare with the package too. Got a great deal.
The only reason I didn't go for a 17" is because that spec in 17" is well over £2.5k. I got mine for ~£1.6k, with my student discount. Only slightly more than the normal price of a 15", and considerably cheaper than the base 17".
The 17" doesn't come with an SD slot either. Which would be annoying for me. It comes with an ExpressCard slot.