Two simple observations, to either embrace or ignore.
1) Larger speakers tend to do music better. If you limit yourself to these cute, tiny speaker systems, you may well be disappointed in the overall musical ability. While they are adequate for the SFX in a movie, their non-musical heriatge tends to be more obvious when playing "real" music.
2) When auditioning speaker systems, ignore the HT aspect andconcentrate on their musical attributes. Virtually any multi channel system will sound impressive on movies but, as you discovered, they may well lack on music. It's heartbreaking to see how many realize this too late,
That said, if full size speakers are not out of the question, Check out the Athena Auditon series at AudioAdvisor or possibly (don't laugh) Best Buy.
For your budget you should be able to score a pair of AS-F1 (or F2's if they are on sale), AS-B1 or B2's for surrounds and the C1 ? center speaker. You can always add a subwoofer later, should you feel it's needed with this combo.