I went the 28-70 because I wanted the lens for full length portraits. And naturally there are opportuntity costs for wide ranging zooms.
I gave the 17-55 due consideration, but 17mm end was not what I wanted from that lens at the time.
Stepping back though, ask this question with your kit (actual, and planned) layed out on the table. Depending on your usage, 12-24, 28-70, 70-200 is an awesome layout (add 200-400 after tattslotto).
Another influencing factor for me, was the DX. The 28-70 is a 15 year old lens, designed for "full frame" 35mm. I'm sure that will wash through, and nikon will get there, this year, this decade, dont know, but definitely within the life of the glass I was going to buy. the 17-55 I understand will not work on film, nor full frame if we ever get there. My lens investment is for 20+ years, so that weighed in heavy for me.
That said, I would still like at times, as you said, car shots, I miss the 17mm end if the 12-24 is not in the bag. Also, for
model shoots, if I have a car, or some similar size prop, I would love the flaxibility without lens change, to go 17-55mm. So I have a second body with 12-24 on board.
DX was the clincher for me...