A friend asked about decent interfaces that are on the cheap side, but everything I came up with off the top of my head has been discontinued. (it's been a while since i was in the loop)
The focusrite Scarlett line seems to be popular. I have the 2i2 and have no complaints with it except that I can't easily balance playback vs foldback levels. The 2i4 has a blend knob. All interfaces should have a blend knob.