I have an A8N32-SLI mobo and I already have SLI 7800gts. That means my only non-pci-e slots available are between my video cards, and that space is currently occupied by a bunch or cables that can't go anywhere else, plus I don't want heat to be a major issue. So my only option for sound card upgrades is to get an external card. What external USB based audio solutions are there? I would like to spend no more than 150 bucks for the audio. So, what would you recommend? I would like something similar to the x-fi or audigy 4 in quality. I am aware of the extigy, which is based on the audigy 1, but I would like to go higher end than that. Any help is greatly appreciated.