In order to get good sound you need 3 things; good speakers, a good power source, and a good signal. "Wireless" (I put it in quotes since I have yet to see a true wireless system, though many claim they are wireless) gets rid of 2/3 of those.
The onkyo you selected would be a fine choice. Stick with that.
i'm about to buy the 7.1 onkyo ht-s5100 home theater system. i was hoping to make my surrounds wireless but all the wireless products are only for two channels. is there a four channel one out there, can i use two stereo ones in tandem, or am i sol and stuck with wires.
before you say i should buy another system instead, these are my requirements: no built-in disk drive of any kind, substantial wattage outputs, hdmi switching, and ipod dock.