I'm looking into the Harman Kardon Go and the Altec iM7. Anyone have any experience with these, or can recommend another system?

Thanks

 

If you can get ahold of the original boombox, ipod hi-fi (made by Bose) you should get that one. I've had it for two years and never has it let me down, plus the sound is as clear and massive as always.
I have had it on many many pre-partys, it's been on spring break in Mexico, it's been to California for a year, it's been brought to beaches, I've had it when sailing for weeks and I've used it to on the maximum volume for many times.

It's just so well-built and you'll be staggered at how good it sounds like. I listened to the new B&W zeppelin but the sound was the same as mine.
I don't know about hte other ones you listed, I've had these small Altec Lansing speakers for the iPod but they broke down after some time. Not hte best quality imo.

ftw!