Hi. I can't speak for the Klipch speakers, but I have owned the basic 5.1 Orb setup with a center channel Mod2 upgrade and can say that for small to medium sized rooms, these speakers can really hold their own. They are a very effortless speaker to listen to and the center channel in particular is extremely smooth. The hot setup would be to go with Mod2's for right, left and center, and then just use the Mod1's for surround.
The Super Eight is a very good sounding subwoofer with plenty of low-end energy and is also quite musical to boot. I'm certain there are bigger, badder subs out there, bur for it's size and price, it's a real winner. My suggestion would be to take advantage of Orb's 30-day trial policy and give them a go. If you're not happy, send them back and try something else.