I agree with everyone else - LOVE #1. It fits perfectly and is quite slimming as well. #3 is very cute as well.
I am not crazy about #2 - to my eye, it appears a little too short. The banding or whatever it is below the bust seems to hit slightly too high, which might be contributing to the boxiness. I am also not a fan of short sleeved button-downs but that is just my personal taste - I prefer them to have full-length sleeves that I can roll up. I don't remember if you already have one, but have you tried a silk button down shirt? Silk will drape much more nicely and is actually very cool for summer.