I definitely think the cables mentioned so far are quality cables. Especially since I've owned all of them. Couple comments though if you want 'em ...
1) Planet Waves- the compression springs have either sqashed on themselves or broken a couple times, and over time one clearly 'wore' the jack on one of my guitars just that much wider (because of the width of the compression spring). Now, any other cable is a little loose in that jack. Very uncool.
2) George L's- for an instrument cable from your guitar to the amp (or board), I didn't like how rigid they were... they don't lay nicely. Something very wire-y about them. Almost like you can crimp/bend them and they'd just stay that way. But for hooking pedals to eachother, great.
3) Klotz LaGrange- Really like the fidelity and rugged build of the cable. Heavy duty cable, big-ass Neutrik connectors. But it's very thick and not very flexible. Almost too heavy-duty. Great sound though. And seems indestructable.
4) Spectraflex- really good all-around cable. Not the clearest sounding, but so easy to deal with, rugged enough, and cheap.
5) DiMarzio- again, a fine cable. But that braided exeterior jacket just irritates the hell out of me. It's like a constantly 'starched' cable. I use it still for patching things or other stuff... Certainly above average, but no way I'd plug my guitar into this snake with rigor mortis.
Currently, I'm using Bayou cable for my instrument cable, and got one of their 3' speaker cables (way impressive) too, to run from a head to a cab. The instrument cable is nice Canare cable, and Neutrik connectors are offered although I opted for G&H connectors. It's 90% as good sounding as the Klotz, but as flexible and easy to deal with as the Planet Waves cable. And inexpensive too. My current #1. Check 'em if you want to: