Glidecam Devin Graham stabilizer w/ X-10 (smooth shooter upgrade). The Devin Graham stablizer combo can hold 2 more lbs and can operate in underslung mode for low-to-the-ground shots.
The X-10 steadicam is a huge step up from the smooth shooter, as it allows you not only to move smoothly side to side, but also up and down. It is solid, and the best steadicam in its class. The Devin Graham signature series is likewise a big step up from the HD4000. It is far easier to adjust, lighter, and can operate in underslung mode.
Glidecam X-10 Vest and arms
Glidecam HD4000 w/weights, quic