hey good on you for having the motivation to run, during winter i have none whatsoever.

I find the sport bra's in kmart/target are good- but really it is an individual thing. I think they also have them rated at different impact levels- like running to jogging to walking to high impact sports.Try a few on in the change rooms and jog on the spot and jump up and down just to get some kind of idea. Sorry not really that helpful, but hope it help a bit. Good luck.