Zach Quatronostro

Well, mountability and compatibility should be a pretty big factor. I found this cool little DSLR right that lets you mount a matte box and follow focus for pretty cheap: http://www.habbycam.com/Habbycam_DSLR_Cage_and_15mm_Rod_KIt_p/supports_cage_rod_kit.htm

Well as far as follow focus mounting devices, there are a few options. I've always liked the products at habbycam.com ESPECIALLY the DLSR Studio kit which lets you mount not only the follow focus but also the matte box, a zoom audio recorder and an HD monitor- all right to the rig itself. Very inexpensive as well: http://www.habbycam.com/Habbycam_DSLR_Cage_and_15mm_Rod_KIt_p/supports_cage_rod_kit.htm