Hardware :: Hard Time Selecting Good Desktop Speakers For IMac

I'm looking at getting some good quality speakers for my new iMac. My budget is up to about $250. So far I've auditioned the following speakers;

1. Logitech Z2300. These sounded boomy and mushy to me. They are a good value though at around $150.

2. Bose Companion 3. I like the little hockey puck remote unit. They sounded very weak on mid-range. Surprisingly good low end output though.

3. Audio Engine A2. I really, really, really like these speakers. Until I play something with a lot of low end in them, then they just start farting because they can't handle anything under 100 hertz very well.

What I would really like to do is get the Audio Engine A2 and pair them up with a subwoofer at a later time, but in their short sightedness Audio Engine didn't put line outputs from the A2 so from what I can see there is no way to get them hooked up to a subwoofer.