I'd suggest saving a little more but, Logitech will pretty much be your best bet for cheaper speakers, try to stay away from cheaper creatives, if you can save a little more the Logitech Z623's are really powerfull speakers with good sound quality and you can find them for $99 in some places or even the Logitech Z506's which are decent but mainly good because you can get 5.1 surround for around $70.
hope that helped.