Self-powered mini speakers for iPod

Have any of you compared some of the better, self-powered pairs of minispeakers, such as:
- Audioengine 2, 5
- Sierra
- M-Audio
- others you've found?

I'd like to order a pair sight unseen (with refund option), and thought I may as well listen to the voice of experience before making a choice.

I haven't compared the speakers that you list, but I own two sets of the Audioengine 2 self-powered speakers. They are excellent and the bargain of the year at about $199 shipped, as I recall. Well made, detailed and musical sound, compact, inexpensive. They are low-cost enough to serve as computer speakers and hi-fi enough to work as a nice little set of monitors for a music only system.
I am very happy with Audioengine 2. They also have great customer service.
Be sure to consider the Kanto iPair 5 Audiophile Powered Speakers with iPod Docking Station and Remote. No amplifier is required since they contain their own 50WPC Stereo amplifier. 5" Carbon Fiber woofer with 1" Dome tweeter. Incorporates iPod dock, pair of line-in RCA inputs to add a CD player or other source, 1/8" mini plug input, S video for viewing iPod video and USB input for computer audio. Fully shielded. This compact system does it all! Beautiful Piano finish.
If your budget allows you might consider the NHT M-00.

Out of the 3 you list the Audioengine is superior to the other 2 in every way you can describe a powered speaker.
Nick, thanks for the comparison, I appreciate that a lot. Some people have said that Audioengine have a "midrange suckout". Have you heard anything about this?

How do you think the NHT M-00 compares to the Audioengine?

Dan, do you happen to know how does the Kanto compare to the ones being discussed on this thread?

The audioengine is a good sounding mini monitor that out performs anything else in it's size or price range. You'll find plenty of opinions to support mine, and like everything else in audio, those who claim otherwise.

The NHT M-00 is a far superior speaker by comparison. They are impressive in that they are more 'articulate.' Something that us audio engineers look for. I first heard them in Chuck Ainley's studio in Nashville. I own a recording studio on the west coast and use them.