While they're not very expensive, I've had great results with Focusrite interfaces. Excellent mic preamps, and the models from $250-$300 on up have digital input, multiple TRS line I/O, etc. Software mixing / routing control is great also. I've been using the Saffire Pro 14 (FireWire) for the last several years and it is rock solid. The Scarlett line is the USB range, and they have a Clarett thunderbolt range also. The other lines are the very high-end options, probably far beyond your needs.