One more question, and then I will probably leave it to others to reply, as I have not shopped for speakers in your price range in a long time.
Are you wanting a full 5.1 set of speakers, or will you settle for fewer speakers?
The thing to think about before you answer is this: If you bought just a pair of bookshelf speakers, you could get much higher quality speakers for your budget than if you divide it all up for 5.1 speakers. I personally would recommend auditioning speakers and noticing the differences for yourself between sets of speakers in your price range, and a pair of speakers in your price range. If it were me, I would go for quality over quantity, but you may feel differently than I do about such things.
Here is an example of a pair of speakers that might be okay:
Your budget is not high enough to get a full set of those plus subwoofer, but a pair are within your target budget.
Edited by Jack D Ripper - 1/30/14 at 7:46pm