Lululemon tops are great! Built in bra, hold up well in the wash, look awesome. What else is there? I have a couple of Athleta pants, like those as well.
One thing about lulu--they don't take items back if they are on sale. A friend bought an item on sale, found a hole--they refused to take it back. Keep that in mind and inspect stuff carefully before paying.
I do have a really nice workout T-shirt from Old Navy that cost a quarter of the price--love it! The difference: no support and the look is cute but a lot more basic.