I think I've done it all. I started with 24 ga zip cord that came with the Sony 5.1 system I bought. Upgraded to 16 ga zip cord when I bought some JBL speakers. Bought the 12 ga zip cord from Home Depot and rewired everything when I moved into a different house. Got a great deal on a set of Monster M2.2 on eBay shortly after I bought my JBL L7. Replaced the 12 ga zip with a Monster M1.2 center cable when Tweeter went belly-up. I did pay $250 for the 8 foot pair of M2.2s and $40 for the M1.2s center. The most I've ever spent for cabling of those lengths BUT I also dropped about $4000 in upgrades. Replaced the Home Depot 12 ga zip cord with 12 ga CL2 when that crap started turning green. Went with 10 ga CL3 when I added 4 more speakers and replaced the rest of the Home Depot 12 ga zip with the scrap 12 ga CL2. I still have the Monster cables for the front three. I guess I've had the L/R for more than 10 years.
I use KnuKonceptz CL3 10 ga and 12 ga. I mainly based my current wire choice on flexibility, gauge needed for length of run, and round rubber sheath. A round molded sheath makes the cable look uniform when covered with TechFlex. The Monoprice and the Tributaries I bought before that had a thin plastic sheath. You could see the twists in the two conductors even when covered in TechFlex.
My resistance for ALL my cables is very low now -- all under 0.04 Ohms -- with the short runs to the Height speakers still split at the wall plate and the long runs going straight through the wall plate.
HD-DVD = 94
Blu-Ray = 120 ( 24 Warner red2blu )