Some of my photography magazines list a few good ones.
I'll try to post this again (I almost finished it the first time and lost the whole post

)
Here's the info I found in the magazines - hope something here can be helpful.
1. There is an article titled D-SLR Camera Bags, but most of them aren't backpacks. The only one shown is a Tenba Shootout Mini Backpack.
~holds DSLR, lenses, and accessories with a laptop pocket.
~has adjustable bottom straps to hold a monopod, umbrella, or ground cover.
~shown in gray/black but maybe it has other color choices.
2. Lowepro CompuTrekker AW Backpacks
~all 3 models shown in black
~hold DSLRs, lenses, media cards, laptops, and accessories - all to varying degrees depending on which on you get.
~said it will protect your gear under most severe weather conditions
3. Lowepro Vertex Series backpacks
~shown in black with gray interior
~holds DSLR, lenses, accessories, and laptop
~removable tripod holder to hold tri- or mono-pod
~all weather additional cover to protect against weather, sand, and dust (shown in gray/white but maybe they offer black too.)
The article listed in #1 has references. Maybe these sites might have what you are looking for:
Adorama (
www.adorama.com)
Billingham (R.T.S.) (
www.rtsphoto.com)
Crumpler (
www.crumplerbags.com)
Domke (Tiffen) (
www.tiffen.com)
Kata (Bogen)(
www.bogenimaging.us)
Lowepro (
www.lowepro.com)
M-Rock (
www.m-rock.com)
Naneu Pro (
www.naneupro.com)
Pelican (
www.pelicanproducts.us)
Roadwired (
www.roadwired.com)
Tamrac (
www.tamrac.com)
Tenba (
www.tenba.com)
Think Tank Photo (
www.thinktankphoto.com)
They also list a previous article that can be referenced on their website.
the article is "Bag It!" from May '04 found at
www.pcphotomag.com.
Hope there is something helpful here.