I am far from a Barnett fan. (That's as nice as I can be about it) Craigslist is plum full of used Barnett crossbows, that should tell it all. Tenpoints warranty and customer service is Excellent! The Wicked Ridge Models are exceptional in their price range. Only thing they are lacking is blazing speed. I have gotten 2 reports from our members who have shot or own a Centerpoint crossbow. They both say the bow is a dead-nut shooter. 40 and 50 yard shots are on the money. Their warranty is only 5 years but that is not bad for a bow under 300. They also shoot up to 370 fps. (229.00 w/free shipping currently on ebay) Equally in the speed department is The Killer Instinct 370. I have one, Dave Giles bought one and Mao bought one for his daughter (His is the Machine 380 model I believe) All reports came in good for the KI brand.
With shoulder problems, I would say you are gonna like the crossbow. (Beats the shit out of not hunting!) If I were you, I would try the Centerpoint first. If you decide to upgrade or go back to a compound, you should get 200. of your money back next year without a problem! If you do order it, do it fast as they are Moving Quick! Hope this helps out. Make sure you let us know what you do get and how you like it. Good Luck!