ICE!! I'm pretty lucky since we're in L.A. I believe they have the best wire available. I bugged them to start making 500' bare copper quad shield and they finally did! So much nicer and lighter than 1k boxes. They deliver right to my job sites, sweet!
I used to use Avad's private label years go (I forgot the name) and it was on par with ICE but they started selling SCP and I didn't like it. The cat6 was stiff and just didn't seem it was on the same level as ICE's cat6. This was three or four years ago, so maybe they've changed, but I'm not changing over from ICE unless something drastic changes my customer base and I'd have to adjust things.
I also tried Snaps Binary and tossed it in the trash, this was a couple of years ago though.
My 2 cents...