I have both a TenPoint and a Barnett. The TenPoint cost about $1000, and the Barnett cost about $350.
Other than the TenPoint having a slightly better camoflauge design, there's not much difference between them.
They both shoot just as fast, just as accurately, just as loud, and both kill deer dead.
If I had to do it again I'd just buy the Barnett and not the TenPoint, but only because the TenPoint costs so much more. TenPoint has the Wicked Ridge line of less expensive crossbows that I would invest in if I were back in the market again.
Crossbows have come a long way in the past 4 years. You can find quality in almost every brand, and brand is no longer as important as it once was. They all do the same thing, have about the same features with a few minor differences here and there.
The one thing that I would definitely look for, and it will add some money to your purchase, is a crank-cocking device. The only reason that's important is if you are hunting out of a treestand. You don't want to change your center of gravity on a small platform while using a rope cocking device. The crank-cocking device allows you to safely chocolate chip cookie your crossbow while in a treestand.