Best Computer Speakers

Quad makes some powered bookshelf speakers. You may want to consider them as well.

Another very satisfied customer with Audioengine A2. Mine are connected to a Squeezebox Touch. I haven't compared to other models mentioned, though, but these sound awfully good for their size and price.

Here is my recommendation. I've been using these speakers for years; I'm completely satisfied.

Focal XS 2.1 Speaker System from Music Direct at $599.
Sound Quality and Aesthetics Converge in this iPod/Computer System. The Perfect Sound System for Your Desk, Your Office, Your Bedroom, Dorm Room or Den

The Focal XS 2.1 System is one of the best sounding iPod systems you’ll ever hear. If you are interested in a complete audio system for your computer system or even as a stand-alone iPod music system, the XS 2.1 sounds incredible. The built-in Burr-Brown USB DAC allows you to plug it into your computer and start listening to much improved sound from your digital files.

I absolutely love my Audioengine A5+ speakers with the Desktop Speaker Stands and the S8 powered subwoofer. I use this with my 27"IMac computer and the Dragon Fly Dac. Very dynamic and great sounding.
You might not need the subwoofer and the A2+ speakers might sound good also however I went the direction of the A5+ and I'm extremely satisfied.
I never heard the A2+ speakers.

the BEST speaker?

maybe the little Magnepan system?

a bit pricey I am sure