ash recomBag for a 50D, 2 lenses and a flmendations?

I'm looking for a bag to carry the following:

50D
17-55
70-200 f4 IS
580EX II

I currently use a Crumpler Wickey & Cox but would like to find a bag which I could use to swap lenses without taking the bag off my back. The Wickey & Cox is a good bag for long distance travel but I need something which I can use on the weekend. Basically a bag for a DSLR, 2 lenses and a flash.

I did consider the 6MDH but am not too excited about the loud velcro which alot of people are talking about.

Thanks.

Edit: Apologies for the messed up title. Keyboard acting up...