I think this points out the questionable nature of "Quality".
Real World was recorded with a $30 interface. Shine was recorded with a (currently) $500 interface (it was $800 a few months ago). There are other differences too, like all SM57s-58s on Real World, and the addition of a really awesome condenser mic on Shine, but the point is that I think your end result will depend more on your skills then on the differences between a $300 and $500 interface.
I know iSteveus uses a USB Alesis console and from all his posts, he's been very happy with it. The FireWire version will give you up to 8 tracks (USB gets you 2)
With that $50 rebate knocking the price down to $250, I think it's a really good choice for what you want to do.
Hope that helps. ~~Hang
EDIT: Thanks for the Compliment, BTW B-)>