How many inputs/outputs do you need? They really don't offer any interfaces in that price range. Their PCI cards are just the converters and some DSP...you'd need some sort of I/O box to connect to them.
If you're set on an RME, I'd save up and get the BabyFace Pro if you don't need many simultaneous inputs/outputs. Or save up (quite a bit) more for the FireFace UCX if you need more I/O.