For me a G17, is just too big for daily carry. I would carry it if it was work related, but even then I would opt for a different gun if allowed to.
I would more likely go with the G19, or a P30. I would have said a 1911, but not with todays terror threat. Two semi auto hi-cap guns are what makes sense, nd with the same ammo and mags if possible, so if you "had" to choose a 17 for your dept gun, then a 19 as backup would be the way to go. or the same thing with M&P. A 17 round 5 inch and a 12 round 9C. CZ, same thing, "if they allowed it, or FN.
buying 2 H&K pistols could get a little pricy if they are hammer fired models, your looking at close to 2-4 grand plus extra mags holsters, NS, laser etc.