Identification: Anybody know what kind of cactus this is?

I just barely bought him, and I think he might be some type of torch cactus. I don't know, though.

 

Possibly Trichocereus. It is a bit too young to be reliably identified, though.

 

I was inclined to believe that it was Trichocereus peruviana , but the fact that it has 10 ribs kinda dissuaded me from that.

 

So your plant has 10 ribs? Then T. peruvianus i less likely, but there are other candiates, like T. huascha and its close relatives.