Jackson Zen Medium
I have a Zen Medium and I am 5'8" and 185. It is very comfortable and still roomy. I had to carve out the foam in front of the bulkhead to make room for leg extension. You would have to do this as well to get it comfortable. If possible, I would demo both the M and L size. I do like the boat a lot, but I don't really do Class V anymore, just up to class IV or IV+. I see a lot of Nirvana's here in Steamboat among the younger Class V crowd, so that would also be a possibility. I paddled a Dagger Mamba in Ecuador over the winter and liked that as well.