I have starting mixing a little bit on my iMac. I just picked up a pair of M-Audio BX5a's. I am currently running them out of the audio out with a y splitter (yuck I know!). I am looking for an inexpensive audio interface with 1/4 outputs. I really do not need any midi inputs and such right now, but wouldn't mind having them for the future. What are my options? Thanks!