The wire is fine.
Promedias are the lowest level, they are awsome. Promedia ultra 5.1 must be better, I bet they f-ing rock even more. The quintet speakers will beat them both, I will bet on it. The promedia sub is nice, the pm ultra sub is probably better, ive had the promedias I now have the quintets with the ksw 10. it was a big step up. I like my ksw 10 but it is priced high and you can probably find a better deal for your sub. Ive said it many times, place the quintets near the back wall (2 inches from wall) and mount them if you can. But no more than 2 feet from sidewalls.