I've not used the Behringer C-1, but I would point out that Behringer are a difficult company to deal with if your equipment develops faults (there are plenty of horror stories on this website), and Studio Projects have a reputation for looking after their customers.
We don't stock Studio Projects at my shop, so I can't tell you reliability on them, but we are very wary of selling Behringer stuff because it comes back so much more often than it should. If I start selling Studio Projects, I'll let you know what their return rate is like!