$80 ?
I dont think youre actually stepping up over the CL card that way.
I think cost is an issue for you for now. If so, and it is for me too now and then, I'd go with as good a firewire or USB (outboard) PC soundcard for now. I have one of those CL cards too.
M audio cards do sound better. No question.
Going out of the card into the exact same DAC, with a different interface (coax) than USB, you will gain more accuracy and depth... or I should say in my case, that's what happened
as I could set the software to emulate upsampling to 24/96 or 24/192.
Also, down the road you can take more time to get a good to great DAC, which will definitely be an improvement.
Youll also have a fall back unit just in case.
Look at the M audio 24/192 outboard card
About $200
Sam Ash carries them as do many others. I go to Ash cause theyre close by and flexible when you show them cash. Their online outlet is right here in my town, but sometimes theyll differ on price from their BM stores, so check out both, if possible
J R music also caries them. Both are price competitive. Both are good places to buy from in my exp.