My choice would be the Focusrite Scarlett 18i20 at $500 or the PreSonus AudioBox 1818VSL at $400. You might get good results with the Behringer UMC1820 at $300, though my experience with Behringer has been a mix. I had bad luck with a previous interface but love their studio monitors.
I use the Focusrite model a lot and have a smaller version of the Presonus which works well.