I have an Audix F-50 and nothing to plug it into as such except my laptop's soundcard which has a horrible preamp.

I was thinking of maybe getting an MXL Mic Mate though I'm on the look out for decent audio interfaces around the same price.

The thing is I don't have a lot of money right now but I probably will have a bit more down the road when I'm more into serious recording - I don't want to spend $100+ on a "Better" Audio interface that I end up replacing anyway.

I'd rather it be powered off USB since I don't have many free slots. I know this will probably limit how awesome it can be as a preamp, but if it has a good A/D it won't need to be that great.