I need custom T-Shirts, but which website is the best?

I need to order a bunch of custom T-Shirts, but there are just sooooo many different websites out there! Which one(s) have you to found to be the best?
I would prefer if they were really nice cotton shirts, (nothing too scratchy or cheap,) and I’ll also need to be able to print [names] on the back.
Thanks for your help!