You need to do some long test rides, and keep in mind that when it comes to comfort, everyone seems to be different. As Gary Mc mentioned, the recline of a bent's seat can make a big difference. Also, bents have two very different types of seats: mesh seats and hard seats. The bikes with hard seats tend to have more recline.

My biggest health issue is my back (degenerative discs, L4-L5 is the biggest problem). My Tsunami T-1 SWB (manufactured by China Mascot, same as ActionBent) has the hard seat. I keep it reclined all the way back, ride about 100 miles a week, keep pushing myself harder and harder, and just don't get any back pain from the bike at all. I would say that you can probably do that too, but you're going to have to prove that, yourself. The fit of a bike is important, just like the seat is. Good luck in finding one that works for you.