Hey Mad,
I know you don't own this, but how do you think the creative recon3D stacks up to the Mixamp?
http://www.amazon.com/Creative-Blaster-Recon3D-External-Enhancer/dp/B005FKT70O/ref=sr_1_1?s=electronics&ie=UTF8&qid=1344395655&sr=1-1&keywords=creative+sound+blaster+recon3d+usb
I know you don't own it, but it looks like it has everything the Mixamp has, and more features & compatability to boot. For $99. If your Mixamps broke, would you consider buying this Recon3D to replace it instead?
P.S. sound output on my Mac stopped working, still isn't fixed yet.