I found a cute running store online called One More Mile. They sell the most comfortable long sleeve running shirts with catchy sayings. The prices are reasonable, and the selection is huge. I LOVE my new running shirt from there. It says "Find your happy pace" on the front and that saying is just so...me! I'm not obsessed with breaking speed records.
The material is specially made for running, and it looks like it would work great even though I have not run in my shirt yet. I love it so much I kind of hate to sweat on it. It's becoming my favorite lounge around the house shirt. They have another one I like that I plan to buy after I run the half marathon in January. It says "13.1 and still smiling." Again, perfect.