There's a lot of awesome brands to consider when looking for outdoor apparel. The North Face is the favorite of many. Patagonia is hip, and solid. Outdoor Research is little-known, but very nice. But, to date, I've never found a brand that I like as much as Arc'teryx.
Here are three of my favorite tops - form, function and multi-faceted usage:
Ether Longsleeve Crew - When it's cool out or you need an extra layer that doesn't carry a potent smell when wet. This longsleeve top is great for running on crisp mornings and for sun protection when out on the water when it's not too hot out.
Rho AR Top - Phenomenal when it's a bit colder and you're wanting to feel cozy. I often wear it when my roommate from Seattle turns on the ac down to frigid temperatures. No animocity, I just bust out the Rho.
Skyline Shirt - Probably the coolest shirt I own...in terms of awesomeness. It's a dress button-up that looks moderately like silk. But it's made from wicking materials that keeps the sweat away from you when it's hot out (I got the shirt to wear in developing countries when it's important to dress nice in the honor of your hosts.)
But the best part about all the Arc'teryx clothing is that it fits better. I desire an athletic build because I am slight of frame