Hi, I've been DJ'ing with my friend's iBook for a number of months via my desktop PC and an e-mu 0404 pci interface. However, as you can imagine it's pretty hefty to lug the huge PC around everywhere so I've upgraded to a MacBook in the hope to make things easier but it's just brought some problems so far.
Basically, I'm looking for an audio interface that will allow both the laptops to hook up (allow listening of each other before output), allow pre-listening for both and also route both to the same output. The cheaper the better as we are both students!
Alternatively other suggestions are welcome

and is it worth buying a hi-def audio converter instead of the supplied CoreAudio from Apple?
Thanks in advance
Tim