If i were you I would save money on the soundcard and buy better speakers.
SB Audigy 2ZS + z5300
Fatal1ty + x-530
The combo i mentioned is FAR superior to any sound card paired with those x-530.
Cheap logitechs are not very good. If you must have speakers costing under 100$, go with these:
Just remember when shopping for speakers, any specs basically mean nothing to a certain point. The only way to tell which are most appropriate or sound best is if you test and hear them yourself.