I'm using the Lowepro Rezo 190 AW.
Holding these stuff usually, 40D + BG-E2N, 18-55 IS, 50f1.8, 85L, 135L, 580EX ii, bounce card, spare batts, memory cards and some accessories. The bag is good quality, and pretty comfortable on the shoulders.
I suggest that you go for a bag that is slightly bigger than your equipments, in case you buy 1 more lens or flash. Then still got enuf space to put everything in.