Odd, I consider the Claro to be the second best card on the market, behind only the godly ASUS Essence STX...
Some notes:
Music encoded in 2.0 channels will sound exactly the same. Just because you have 7.1 speakers doesn't mean that music encoded for two channels will suddenly fill all the other speakers. You CAN use something like Dolby Pro Logic to upmix the audio though...
Make sure windows is set to use 7.1, and run a full speaker test through the Windows Control Panel to make sure all the speakers are working right.
After that, check the driver control panel (I'm not sure on how the HT Omega display looks like, but its probably based on teh standard C-Media driver suit...) and toy around with the settings, equalizer, etc. These cards can take a lot of configuring to get set up properly.
Never use the front panel; you lose a lot of quality by having the audio signal go through the entire PC before reaching the headphones.
Finally, getting actual surround headphones might help; at the end of the day, your using 2.0 headphones, and wondering why you aren't getting a surround output. Try some surround gaming headphones or actual speakers. [Remember to avoid USB, which ignores the soundcard]