Don't know much about mixing boards with USB (if that's what you have) and if they will work OK. What I do know is that I went through numerous interfaces that all gave plenty of trouble, several dying on me too.
Without an indication how much you want to spend, for your stated requirements, a Focusrite 2i2, available for around $180 would be a good option. They are trouble free and well above your soundcard for both use and performance. For about $800, an RME Babyface is well worth a look. Heaps of good options available between the two price points, and very awesome pro gear well above the RME. Do your google research, narrow it down to exactly what you need, then google again and pick some. Then you could ask here for opinion on your choices. Most are pretty good these days, but IMHO, I would not use M-audio gear for PC/Sonar, based upon my experiences. Good luck.