Recording line input to USB via D/A?
What I need is one, really good analogue line level input to my computer's USB-port. There are lots of USB-based audio interfaces out there (transit, M-audio, etc.), but most of them have a plethora of different kinds of inputs and outputs, or seem kind of low-end, which makes me sceptical of the quality of their A/D-conversion.
My question is: can I get higher audio quality simply buying an A/D-converter with a line input, then converting its pdif-signal to USB? What would I need for the latter part (pdif to USB)?
I've been looking at the ART DI/O tube ADA. Also, there's what seems to be a fairly stereohile-oriented product called X2, its from an Italian company called purebits. You can check it out at http://www.purebits.com/usbsoundcards.html#x2.
I'm completely new to this place, so forgive me if my question is kind of off-center. Any input appreciated. Thanks a lot in advance.