I've researched these a bit & I'm going with the Avid C600. I need 8 ouputs. But I hear the pres are good, lots of features and has 4 ins. If u need 2 ins and 4 outs, the C400 is only $150. Prob will pickup one before Turkey Day.
I have a Presonus Blutube & dont like the plasticy/hollow sound of the pres, so I'm shying away from Presonus.
If I had $750, I would go for a Motu 828.