I did Blue Jeans 10 AWG white too - 50 feet for my back speakers. At 40 cents a foot plus very reasonable shipping I think it's a very nice value for money. The only thing I don't really care for is the faint blue sentence describing the cable printed on it, but you really don't notice from a few feet away and only 8 feet of cable is visible in my home anyway.
Blue Jeans cable has a twist to it that I'm told creates self-shielding, but I can't comment on the science behind that.
For information on choosing gauge for a particular cable length, and other speaker cable points, have a look at:
http://www.roger-russell.com/wire/wire.htm