Paul, maybe I can help here. After reading your post, I went down to the basement, put on my Thermawrap jacket, slipped into a green '09 Hydrogen (long), and zipped it up fully. I'm almost the same measurements as you, but with a 44" chest. I think it will fit the way you want it to, with a bit of extra room to spare.
Now, here's Mama's problem--the sale price will be $254, not $203. The 20% discount can only be had on full-priced items. Being already on sale, the Hydrogen doesn't qualify. Still, if Mama throws you out, you'll have a fine bag to sleep in while you're wedged between a couple of warm dogs.
Edit-Looks like you figured out the 20% thing. I'll also mention that the long version has 2" extra girth from shoulder to foot, compared with the regular length. The regular might be a bit constrictive for what you want to do. Then again, it might just be OK.