The SAT5s are very nice speakers for what they are designed to do. They will work well for casual listening, surround speakers, or serious listening with a sub. The 5.0 is a significant step up in capability (and cost, especially if you include stands). I am a big Soliloquy fan. I own a pair of 6.3s, a pair of 5.0s, a pair of SAT5s, and a C6 center channel. Tell us a little bit more about what you are trying to accomplish and we might be able to be more specific. Regardless of which model you end up with, I think you would be very happy with a pair of Soliloquys.
Good luck.
Brady
Good luck.
Brady