+1 for Focusrite ,
I have the Liquid Saffire 56 and the Pro 24 DSP. Both different animals, one with preamp emulations, one with processors built in. Both have , I beliewve, the I/Os you are looking for.
The Saffire 56 is prob more than you need, the 24DSP is a half rack size though, and more reasonable priced.
The magic is in the software mixer, which allows plenty of configurations to fit your needs, plus you can store the configurations as presets.The latest drivers and Mix version seems to have the bugs worked out, esp with Sonar.