I tried on two sports bras today in a store, this one and a Shock Absorber bra. This one I liked because it separates the breasts (no uniboob) and has smooth cups so your breasts look nice and natural. I'm not sure what model Shock Absorber bra I tried on, but I didn't care to find out because it was lumpy under my shirt. HOWEVER, I am a 32DDD/32F (I have 2 Simone Perele bras in 32F and they fit my back and breasts perfectly), which is the size I tried in the store for this bra, and it was SO tight in the band (but perfect in the cups). I could only get it to hook onto the last set of hooks and even then, it was TIGHT. Another reviewer with the same cup size gave this bra 1 star for that reason, and HerRoom said she's probably not used to the firm support it gives but suggested a 34DD, which I just ordered here in black. I think the 34DD would be much better. I would recommend the black, because I tried the nude on in the store under a white American Apparel tank top, and the top comes out of the neckline a wee bit and so do the straps, so it's a little unflattering with nude pieces sticking out, but with the black, it will look more like I might just be wearing a black undershirt.
We hope you are happy with your new black 34DD. If the cups seem a little snug you may want to go to the 34DDD but it sounds like the 34DD will do fine.
Average Height (5'4"-5'8")