Ok, thanks for the extra info.
If you're aiming high and the ultimate goal is some level of 'studio recording', I'd definitely move away from sound baster.
There are three basic ways to approach this.
1:
Use a mixer with a simple interface like the mbox.
Hook the mixer main outputs to mbox line inputs.
This will record all your channels down to stereo, so you more or less have to get everything right on the night.
There's no real scope for tweaking afterwards.
2:
Use your mixer with a multi channel interface. (Google
echo audiofire 12 as an example).
This would give you 12 discreet simultaneous recordings, assuming your mixer has 12 direct outputs.
That may or may not be enough to cover a full live band, but you could certainly track drums, bass and guitars 'live' then over dub vocals and leads etc.
3:
Just bypass the whole mixer idea and get a multichannel interface with mic preamps built in.
Same as no:2 but obviously you no longer have faders and whatever the mixer offers.
In my opinion this is not really a sacrifice because you still have all the tools at your fingertips in your software.
Hope that's useful to you.