Champion makes two seamless bras I really like, the 02Cool seamless bra and the Friction Free seamless bra. Super comfortable and no chafing -- they offer plenty of support for running for me, but I'm a 34A, so I can't say if they'd be right for you or not. I also like the Champion Sprint Bra, used to be my favorite before discovering just how comfortable seamless bras are -- and I'd guess it would provide adequate support for you. For some reason I've never loved Moving Comfort bras (though I think their running shorts are cut really well and wish they'd come out with a short split short...).