Soundcard with Receiver Doing the Decode

My HTPC currently has a cheap(Siig) soundcard that I am using the optical out to a Yamaha RX-V1. My question is if I am letting the receiver do the digital decoding, how good of a soundcard do I need? I ordered an Asus Xonar DS because I noticed it does higher sampling rates than the Siig does. The Siig gives me a choice of 48KHZ. The Yamaha will go to 96KHZ. I also am using this HTPC for Blu Ray playback. The Xonar DS does not have both DTS and DD decoders but the Yamaha Receiver does. Now back to my original question, since the receiver is doing all the digital to analog conversion, does a more expensive sound card make sense or did I waste my money?

Thanks.