I have a HT Omega Striker and a Asus Xonar DS, they both use a CMedia Chipset, so the drivers for both brands are very similar. if you need lots of inputs and outputs choose the HT Omega card, If you are mostly gaming with your computer, choose the Asus Xonar DS, as it has much better Open AL support.
I've had much more issues with my old Creative X-FI and it's drivers than i've had with the HT Omega or Asus Xonar drivers.
I recently added a Striker to my PC after having too many problems with the HDMI audio on my GTX 580. The Striker is easily the best sound card I've ever used (previous cards were Creative, Auzentech, Asus). I have it connected via digital (coaxial) to my receiver. Everything sounds great.
I have the HT Omega eClaro PCIe sound card. I had an issue on my end, with the 5.1 speaker test sounds not working properly in Win7 pro 64 bit or the eClaro main screen. HT Omega tech support sent me 3 different versions of drivers to try. I found out it was the efffects switch on my Logitech Z906 controller, if any leds are lit only RF & LF sounds work. Anyways I have had no problem with any version of drivers. I don't even know they are there. Unlike creative where I restart my pc to find no sound, screwed up sound or whatever. Switching to eClaro is the best move I've made & I recommend you give them a try. Plus everything works as it should & just sounds great. You can't go wrong here