when they designed this card they had quality recodings in mind, hence the 113db SNR compared to the asus's 120-124db..
if you are panning on using a proffesional card, fond yourself a CREATIVE EMU-1820M. you just can't beat that.
i recommend that you use the ASUS XONAR DELUXE HDAV 1.3 (like i did)
or the HT CLARO XT (which is basicly based on the same chipset)
also, ONKYO makes some good sound cards these days.
All sound cards with SNR 110dB are good enougt for caraudio systems.
I don't agree with your recommendations.
Asus and Claro XT(I have it) do NOt support internal routing so is not very good for making active audio setup in your carpc. EMU-1820M looks like have PatchMix which if I understand right is something like DirectWire(Internal routing)... On market you can find a lot of sound card solution but are you prepared pay 1000USD+ for sound card?