Oh man. You guys should all pick up one of these. I'm snapping them up in every color.
The Arc'teryx Skyline shirt. It's so soft. So stretchy. So breathable. So sunproof. Fits trim but not restrictively so. And it doesn't really show sweat.
FWIW, stains have been easy to get out.
When I go out with my buddy who rides harder than I do, we always ride new roads at a pretty moderate pace, not usually over 60 except on straightways. We pass a good twisty section that looks up to code, we'll turn around and hit it again backwards and forwards at our limits. But not the first time.