I'm far from being an expert on these things, but I've seen my share of small gimbals, and have even built a few myself from scratch. This newly upgraded version of the Senrigan GP-55 3 Axis Gimbal caught my attention because it's now running the new 32 bit Basecam controller (Alexmos) with Dual IMU Sensors and includes a Bluetooth Module. It also comes with the metal housing kit covering the controller and both IMU sensors. There is certainly quite a bit going on here for the price.
Sure it may be a great little kit to mount with medium sized multicopters, but it could be great for handheld use. If it's not super clear by now, these Basecam driven gimbals are completely self contained systems. Once you add battery power, they can fully operate without being mounted to some type of multicopter. Basically if you can find a way to clamp a couple of handles over the top of these units, you'll have yourself a working 32 Bit Dual IMU 3 Axis Handheld camera gimbal stabilizer.
Of course the only problem with this particular gimbal is that the frame will limit you to work with smaller cameras around the size of a Sony NEX5 or possibly a BlackMagic Pocket Cinema Camera with either a Lumix 14mm or 20mm pancake lens. Or possibly with one of those new Panasonic 4K compact cameras i've been eyeballing.
You can check out additional photos and info on the Senrigan GP55 Gimbal (found here)
Senrigan Alware GP55 2 Axis Gimbal Stabilizer