Best Sounding 2 Channel Sound Card

Its times like this that one realizes how limited their PC knowledge really is. I've been reading sound card reviews for about an hour and am no closer to knowing which one is best for my purposes. I have over 15,000 MP3 files on my PC, most recorded above 190. I want to connect my PC to my main stereo (McIntosh C2200 tube preamp, Mac MC352 SS amp and Merlin VSM-M speakers).
Looking to get the best sound practical without spending a fortune. Mostly just use it for 2 channel playback. Some recording, but not much. Is the Soundblaster Audiology II Platinum pretty good or should I go for something more exotic? Most the more expensive units seem to focus on recording. Thanks in advance... Jim