If you're going for something simple like that, I'd think you wouldn't want to go with any kind of mixer at all. Why not just buy a portable recorder? Zoom makes the H2 and H4, which, in my opinion, are two of the best recording devices for the money. They self-adjust for gain and room reverb - everything. I know Zoom has a reputation for making "bang for the buck" type gear, but this is also top notch quality stuff. And the sound quality is pretty darn solid. I had one of my piano recitals recorded on it. I can send you clips if you'd like to hear how it turned out. All it was was a freind of mine sitting in the second row with it on a stand.
Here's more info on the H2:
http://www.samsontech.com/products/productpage.cfm?prodid=1916And the H4:
http://www.samsontech.com/products/productpage.cfm?prodID=1901It sounds like those would be more worth your while. Basically a studio you can carry in your pocket. And the Zoom recorders support formats that you can dump into Cubase, ProTools, Garage Band, and whatever other programs you like. So you can still take the tracks you've recorded, put them on your computer and edit them to perfection.
I'd still be happy to send you the tracks from the times I've used it. Just an H2. No software. So you'd hear it, essentially, raw.
Let me know if this helps.
Peace,
ShackMan
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