I'm a new, but big fan, of Champion Athletic Shirts. Specifically, I love their PowerTrain PowerFlex shirts. They fit well, come in a variety of colors, are well made and have a longer tail for tall people like me (I'm 6'4" / 194cm) so we don't have to bear our bellies while we run.
The quick-dry fabric is very thin and sheds sweat easily. This is a great shirt for hot climates.
They are on sale at the Champion Athletic site for $6.99! Check it out here.
This is a heck of a deal, so check it out.