A while back I did a demo using a Glidecam HD4000, and my most recent video the Glidecam HD1000. I found that if I wanted to fly a bit more weight than the HD1000 and less weight than the HD4000, my next stabilizer review would be the in between Glidecam HD2000 (right smack in between). I did do a short video on the Glidecam 2000 Pro which totally misses the mark on the fine tuning knobs available on the HD series.
Michael Sato over at DSLRUniversity.com beat me to an official Glidecam HD2000 review. He's got a sample BTS video out on the Raley Field - Sacramento Rivercats where he flexes his 'strumph' flying without a vest. I think my knees would have given out on me if I tried that for very long. To follow up, he's got a full page article written up with more detailed information about the Glidecam HD2000. So between the few reviews i've shown for the HD4000 & HD1000, and the DSLRUniversity.com review on the HD2000, you should have enough resources to find out what might work best for you.