I've got a CW-X and it's my most uniboob-y bra... I really don't much like it.

I'm a 36C - The two I've got that I love, which really don't "turn my two into one" are:
Moving Comfort Cara bra
Natori Sport Underwire Sport bra (I just got it from Title 9, where they call it the "LW Underwire Bra")

The other one I wear that I like but does have a little bit of a uniboob tendency is the Champion Shape T-Back Sports Bra. It does not have an underwire, so it's nice for yoga & probably also for cycling.

Has anyone else tried on the new Nike "Revolutionary Support Bra"? It's the strangest thing - I tried it on in a store but was not convinced that it would actually be supportive and comfortable. It really seemed designed by someone who wanted jiggle.