I have a lowrepro slingshot 200. This bag would be too small for your needs but it is a very nicely designed bag and they have thought of almost everything, they make very nice bags.
They have quite a few bigger bags available that may suit your needs.
Sorry. but, i forgot to mention i currently have a lowepro mini trekker, which wont hold all of my stuff.
Nikon D300+MB-D10 | Tamron 70-200mm f/2.8 | Tamron 90mm f/2.8 Macro | Sigma 10-20mm
18-200mm VR | 85mm f/1.8 | 50mm f/1.8 | SB-600 | Manfrotto 681B & 3232 Monopod--190XPROB & 488RC2 Tripod