I think you have answered it yourself here:
Originally posted by cardikat
3. I would expect to use the 17-70 range far more often than the tele end and having been drooling over this lens for about 2 years (the macro had to come first...)
At the same time you have said you don't use 70-300 a lot but enough to keep it.
So I'd say get 17-70. If you have wanted it for so so long and you know you would be using it... rather keep 70-300 at home and take 10-20/17-70/70macro or take 17-70/70/70-300.
It's all about choices... I used to dream about doing good wildlife shots, good street shots, good landscape shots.... and I was chasing lenses. Finally when I got FA*300/4.5 I realized it's not possible to do it all, so I sold it few weeks after buying it with loss and bough my wife ruby earrings for 1st anniversary. I have decided to concentrate on street/scape photography and lenses between 10-135mm. Using primes I accepted that I will miss some shots but I don't mind it, I like taking my time to compose, focus, reframe, refocus... just to get shot I want.
If you know you will use the lens, buy it...
my 2p
PS:
having said that, I was never fan of super zooms so take my opinion with certain reservation