I have the Prismiq and it works fine with Rhapsody. If you are looking for a perfect product, you will probably not be able to find it. I am not sure that there ever will be one. I would like an HDTivo, with HD resolution on digital pics and movies, a humongous hard-drive, ability to play any and all CODECs that comes along, plays DTS/DD, has unlimited free upgrades for any new technology, looks like any other piece of electronic device in my system, usb/firewire ports for external devices, no noise, half second boot up time, ability to power on/off with a remote, DVI HDMI, LCD display with SSA control, multi zone functions, wireless G, built in XM radio/Sirius etc.. and that is the short list. Keep the price under $200 and everyone will be happy.
The Prismiq has some flaws, mainly the native GUI. However, the slimserver plug-in helps tremendously. Don't know much about the omni-fi. I looked into their car unit and it's hard-drive was too small.