Martellus Bennett reminds me too much of Anthony Fasano. He came up big in two or three games out of the year but was relatively invisible for the rest of them. Not to mention he's not particularly quick, and everyone on this forum is demanding a vertical tight end. Plus he's playing with a quarterback (Eli Manning) that loves throwing to his tight ends - just ask Jeremy Shockey and Kevin Boss. Eli Manning made Kevin Boss, and when he left the Giants he fell off the face of the Earth.
I'm more of a fan of Jared Cook from Tennessee for a free agent tight end option.