The only other two that I know of are the BodyMedia Fit and WildDivine Iom. Neither of these are likely what your looking for though; the BodyMedia Fit is really just for calorie tracking and the Iom is really just for meditation/bio-feedback. (Although there still both pretty cool)
I had the chance to see the Q Sensor in person at the Boston Meetup and was quite impressed, but I think I’ll wait a little bit longer for the Basis and save about $1700.
Might be worth exploring these people: Wild Divine - as mentioned above by Ryan, but I think you can do more with it than it might seem at first sight.
It all looks a bit new-agey when you get there but I’ve ordered from them in the past, and have their (GSR) galvanic skin response apparatus which didn’t cost a fortune. I was also able to download some software from them that creates a realtime GSR graph on my Mac.
It’s all packaged up as a kind of biofeedback application, but you can (or could) choose to ignore that and just use the hardware and the charting package.
Sorry this is slightly vague, but it was a while ago. It’s probably not incredibly accurate but a psychologist friend was pretty impressed at what you get for the price.
Not sure if anyone here is still monitoring this thread, but seeing as how Basis still isn’t out, I figure this is still relevant.
I used the Wayback Machine at archive.org to view the Lego GSR Sensor instructions, and when I did I found this website which is the original site’s content and is still live: http://www.extremenxt.com/gsr.htm
It also includes a download for the code that the guy wrote to process the data using the Lego NXT Mindstorms base set ( updated link to NXT Mindstorms kit that he used: http://www.legoeducation.us/eng/product/lego_mindstorms_education_nxt_base_set/2095 ). Due to the cost of the NXT Base Set, it’s still not what I consider in the consumer “affordable” range (sub-$200), but it’s certainly close.
