Jenny, which Champion do you have? They have many different styles. These are my favorite. And they're on sale now! They change the name every couple of weeks, but they're pretty unmistakable from the picture. (They are not the same as the lower priced, similar-looking C9 by Champion bras that you can get at Target.)
Anyway, what they're currently calling the Shiny Seamless bra is very supportive for my 34B - it's one of the few bras I can wear one layer for high-impact activity, and have no bouncing at all, yet they don't make it hard for me to breathe. Unfortunately TE doesn't carry Champion.
But don't put them in the dryer, I don't think any sports bras will be "durable" with that kind of treatment. Stretch fabrics and heat don't mix.
Re: zip front sports bras, I only ever owned a cheap one. It was very sexy and reasonably supportive, but the base of the zipper chafed like crazy.
Speed comes from what you put behind you. - Judi Ketteler