I am reading online that the Sawn bass unit needs to be placed in between the satellite speakers (and not on the floor like a subwoofer). Not sure if it matters, but worth bringing up.
The only comparable speakers I can think of in the $100-150 price range are the Klipsch ProMedia 2.1. Here is a
forum discussion comparing the Swan to the Klipsch. I have owned the Klipsch and they will be more than sufficient for the room size. They are very good at lower volumes, but when you start to push it, the subwoofer quickly reveals itself to be the weak link that it is. Then again, I am talking about really pushing the Klipsch, well beyond their intended use.
Honestly, I say ditch the idea of using 2.1 computer speakers for movie and music duty. Instead, save up $500 more (total budget $650) and the possibilities for a more appropriate 2.1 setup open up. For example,
AudioSource AMP-100 for $90
EmpTek E5Bi Bookshelf Speakers for $250
Hsu Research STF-1 Subwoofer for $270
Yes, the aforementioned list blows by your budget and then some. But, the performance will handsomely crush many setups in the price range. Then again, thats what you get when you ask an Audioholic for honest opinion on 2.1 computer speakers being used for movies and music
.