Replying to Glidecam 2000 or Glidecam 4000? Help..

Ok so I'm going to invest into a glidecam because their shots are unparallelled to a hand held grip. That being said, I want to know if I should get the 2000 or the 4000. I have a Canon 7D, and I do all my follow cams with my Tokina 11-16mm lens, which puts my total camera weight roughly at 3-3.5lbs range, which is perfect for to 2000. BUT, I aslo have a Canon 70-200mm IS 2.8 II, which puts my weight right over 6lbs, and right out of the range of the 2000's 2-6lb range. So should I get the 4000, ad spend the extra money to accommodate my telephoto, or should i not even be using a glidecam with that lens on anyway. I'm on somewhat of a budget, I don't want to spend extra cash when I don't need to. Lastly HD or Pro, what do you guys think, the users of these products, because I really don't know anything, and unlike some of the people on NS, I'm not going to pretend like I do lol.