Matt, I would recommend that for cable management you use cut-to-length velcro. It doesn't damage cables the way zip ties can, and when you need to add more cables to a bundle you don't have to cut and re-strap.
Here are two good sites:
http://www.fastenation.com/cartSpecify.tmpl?id=32&cart=1176947301446312
http://www.westlake-electronic.com/cgi-bin/store.php?search=1&item_no=RIP-W-75-MRL-BK&detail=1&items_added=1
The first site is less expensive, but they have a minimum order of $50, while the latter has a minimum order of $25, and Priority Mail shipping is dirt cheap and fast. If you want to dress up your cabling even more, I would recommend TechFlex F6 in the size you need. Links are below:
https://www.wirecare.com/products.asp?prod=F6N&prodline=ES
http://www.westlake-electronic.com/cgi-bin/store.php?search=yes&category=CBLM&SUBCAT=SLVNG&MFC=TE&within=F6&remove_kw=
Westlake is cheaper here, but you must buy a whole roll, as opposed to smaller quantities at Wirecare. However, like speaker cable, TechFlex seems to disappear pretty damn fast, so a whole roll might not be a bad idea.
As for why I recommend these products, it's what we use on the engineering campus here at UofM when we do computer lab installations.