I'm a 34DD. Look for "encapsulation" style bras, normal straps instead of racerbacks, and ones sold by bra size instead of S/M/L. Consider the front zip kind. You will NOT look cute in any good high-impact sports bra so shop purely for function. Try to shop in person so you can test the fit. Make sure the band fits well because most of your support will come from there. Personally, I've had good luck at Walmart and Target.