I have owned Audioengines for a year. You get 45 watts per speaker with the Audioengines 5. It is a nice balanced soundstage with nice mids. Works well with Apple products like the iPod or Airport Express.
Alternatively, you should check out Blue Sky Audio's EXO or Pro Media station. You get 35 watts x two speakers plus a 90 watt subwoofer. Available through Guitar Center. This has greater deep bass and more dynamic sound.
Both are the same price, about $300. I listen to the EXO more.
If you want pro level gear, check out the new ATC 16A active speakers. These were just released this month here in the US and are a pro standard for recording and soundtrack work. They cost $3,600 and run circles over most speakers.