The Sony TD10 has been very good at $1500, and now it costs less. The new TD20 will likely be considered the best for 2012 at $1500. Both take 3D at 1080i 60 fps full frame, not side by side, and both can be edited by Sony Vegas and Powerdirector. Both have good zoom functions and good optical stabilization, which help tremendously in 3D video. Both have excellent automatic focus and automatic everything else. Both have excellent 3D screens to monitor what you are taking. The main drawback is that the flip out screen is hard to see in bright sunlight, so you need to make a hood or sun shield out of cardboard, as there is no other viewfinder.
A great choice for close up sports video, underwater video, and very wide shots is the HD Hero 2 3D system now costing $700. It does not have the video stabilization to make hand held shots steady, but it cannot be beat for giving the viewer the feeling of being right there in the action. And when you need a wide angle view, this is the widest you can get. These new HD Hero 2 cameras record 1080p 30 fps each eye for 3D, and they will also do 720 p 60 fps for 3D slow motion shots that are very smooth. This system is the best for rendering fast motion, period. You can edit on the computer with Sony Vegas or with the software they provide free for download, but not with PowerDirector yet. These cameras are spartan, though. No screen or viewfinder is included, you just aim it in the general direction you want to record. There is no zoom, but you can step to a small variety of zoom levels, so you get a choice of very wide angle and something more like a standard 35mm view. These cameras have deep field of view, everything in in focus near and far, so there is no focus adjustment.
I have both the HD Hero system and the TD10, and at today's prices you can get both together for under $2000.