I think 40 or so is a nice focal length for and outdoor walkaround lens. If you'll be using it for indoor portraits and shots though, both 35 and 43 are too long, imo. 31 is pushing it but usable... 28 is better. 24 would be perfect. IMO, 21 is preferable indoors to 28.
Keep in mind, it doesn't matter how sharp or fast or colorful a lens is. If you're looking for non-face shots, IE, actions shots, full body shots, you're lens can be too long. A ~40mm lens is going to be too long indoors for those type of shots. 35 is too... 31 is the first I could use and really, 28 is the first that I'd recommend.
That's just my 2 cents. To me, people are dead on if you're walk around is for outdoors, but if you want it indoors too, you need to go wider.
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