I've got a home recording setup similar to yours, but have never had the need for separate mixer outputs for every channel. I'm not sure I understand what good it would do!

I have a Tascam TM-D1000 mixer with 16 analogue channels. I have my two keyboards, mic preamp, and effects processor plugged straight into my Delta 1010 soundcard's inputs/outputs. I use a spare pair of outputs to go to my mixer for monitoring.

Yes, so in effect my Tascam mixer is just a glorified volume knob. I've found it's just a heck of a lot easier doing all of my mixing within Cubase, for mix recall/automation, etc. than doing it manually with the analogue faders. I love being able to 'patch in' my external effects processor from within Cubase too.

I guess ideally, a killer digital mixer with motorised faders and multichannel interface would be the best route... if money really did grow on trees.

Carrie