I've got 2 Tamrac bags (a 608 and a 610  - both are fairly big and hold a LOT for location shoots) and a Nikon $30 jobbie that is nice and small for going "out and about" without the need for all my doo-dads. I know shooters that live for their Domke and LowePro bags, but I really like Tamrac.

Then I have 2 Pelican 1650 cases - those are massive, heavy, and will survive the next world war, and are waterproof. These are the only things I'd feel safe with cameras AND a laptop (as mentioned above) not bumping each other inside, but good luck carrying it up a set of stairs! They have rollers but sometimes you just have to pick those puppies up - and it's no picnic!

I also have a Lightware 4-section rolling bag/case for a travelling light setup. They have rollers, but agian - sometimes you run into stairs!

Whatever you pick - and there are many good brands out there - get good padding (for those times you didn't mean to bump into something, or drop the bag so fast) and good workmanship quality (as something STARTS to fall apart... it's only the beginning...). LowePro, Tamrac, Domke, Lightware, F65, Tenba - all good names with good quality. Buy the best one you can afford - this is an area you shouldn't skimp on price.

Because you're carrying "sets" of things, I'd suggest you have multiple bags so they don't damage each other in just one bag - but that also means carrying MORE BAGS - yeah, tricky situation you've got there.

Good luck - hope that helps-
-Lew ;-)