Easiest solution would be to get a decent 5.1 or 7.1 reciever to route everything to whatever speakers you decide to get. Important are the number of HDMI in/out's, and what Dolby/DTS techs are supported for decoding (Dolby Digital and DTS are MUSTS!).
Basically, look for a reciever that decodes DD and DTS with several HDMI in/outs. Then look for a 5.1 system. Once you make sure you can plug speakers into the reciever, then most everything can be sent to the reciever via HDMI.