What "Brand" Of Shirt Do You Use?

I know it's dependant probably on the cost, colors available, etc. and it left up to the running of the POD site. But much like everyone has their opinion as to why they chose which POD company they went with, it's the same with shirts which is what I'm asking. I see too many kinds of shirts. I'm kind of familiar with Bella 3001, American Apparel, and Gildan. I think Gildan and Bella are the two most popular that I'm aware of for POD sites. I'm 6'4 and wear a 4XLT so most of these I won't be able to wear to try them myself.

So what kind of shirt did you go with and why? Would you change if you started over?