First thing that comes to mind is a Phonic Helix.
http://www.phonic.com/en/mixers/helix-board-12-firewire-mkii.html
There are bigger ones than this, this is the first I found in their series. Nextag lists it as £200.
This lets you stream X channels of audio from the board to the computer, and acts as a mixer.

However I get the feeling there's more at play here.
What do you already have, what do you want to achieve?

i have 2 8 channel interface's, and a 24/48 channel mixer, but obviously, i have lots of spare channels on my mixer of which i use for playback.. i need to downsize though. i've had a look at the phonics before and the 24 input 16 channel one has got my attention, i was just curious if there is another one out there that is better for the money.