Baseball glove (third base) question?

Im 16 and a varsity third basemen. I consider myself a good and highly competitive player (not trying to brag here). I have a mizuno 11.5" glove and me and my coach agree it is too small for me and the third base. I've decided I need a new glove of the 12" size. I'm a big guy (6 feet tall) with average size hands and im a good fielding guy with soft hands at third. My question is...is 12" a good size for me? or should I consider 11.75" ? And also I was considering webbing and brand. I like the H web, the I web, and the Single Post web. Which one is best for 3rd base? And brand..I like Rawlings and TPX both of them have a series of Stiff Horween leather that I like on ballgloves.com specifically the FL1201C55 and FL1202C55 for TPX and the PRO1000HC for Rawlings. Which is a better glove? Which is better for 3rd base? Thank You!!