This is the only commercially made model I know of. There is at least one company that will modify a modern speedlite for IR usage, but that is really expensive ($400_ flash & cost of the mods) and the output power is greatly reduced. The Sunpak Nocto is based on a "hammerhead" flash meant for large format film cameras, so it's output is much more powerful.
Probably a "normal" (visible light) hammerhead. It would definitely be of use as a fill flash. I am just now beginning to experiment as a strobist as I study product photography. I'll shoot you a PM when I'm not DJing*
*I use the same machine for editing photos, DJing and wasting time on the intertubes. This is what "future shock" feels like.