I bought the Hammock Gear incubator 20* regular with 2 oz extra fill. I am 5 ' 10" with broad shoulders and it seems like the one for me. It was a good price for a 20* considering all the vendor options. $260 here is the web page:
Yeah it's a lot more than my DIY, but mine would never go to 20.. .ever.
I still have a home made top quilt, I figure that I will check out the incubator and determine my other needs after I get it.