I'm only upgrading the centre and mains, have 4 Polk r15's doing the job for surrounds and a 10" velodyne for a sub. All driven by a Denon 3802. Curious, someone here mentioned they would not recomend the Energy Veritas line, any reasons why as I was under the impresion they are quite good. I have only had 1 listen to them though on a expensive Arcam system. (very detailed and loud with good bass)
I will have a closer look at the C-3's as well.