I'm also a fan of Lululemon -- I have a jacket from them that I bought over three years ago in San Francisco, I've worn it to death and washed it many times, and it still looks totally new. I'm also very happy with the yoga pants, running capris and sports bra I bought there.
Lucy is also very good -- I have a couple of tops from there, a pair of running shorts, and a pair of casual pants (not workout) that are winners. I'm finding that even though LL and Lucy are pricier, their stuff holds up really well.
On the other end of the spectrum, I've also found plenty of good things in Target (Champion yoga pants have lasted me years, unfortunately they're getting faded) and TJMaxx and Marshalls -- I keep an eye out for gear from Under Armour, Nike, and Puma.
I also recently bought a running tank from Title Nine and I love it. It's white, which is tricky -- it's lightweight but not see-through, and it does a great job of giving just enough coverage with a sports bra while still keeping me as cool as possible on a 90% humidity, 80 F run!
Oh, as for the items holding up well, I machine wash everything on the gentle cycle (even my bras, in mesh bags), and hang to dry. No problems at all.