Chris and I both have Tumi bags.
I have this one in orange which fits my 17" MacBook Pro:

Chris has this one in Tan which fits his work laptop:
Tumi makes a FANTASTIC bag. High quality and versitle, however the trick is to find them on sale. They can be really expensive. There are several Tumi outlets where discontinued colors can be found and the Tumi site occasionally has sales. If you can find one on sale or one on ebay, t is well worth the price for this excellent bag.
EDIT:
I'd watch this auction.