Freida, are you completely ignoring the 28-300?
I'm so, so, not one of those "I have one, so it's great and everybody should buy one" people. Earlier in this thread I laid out its shortcomings -- it's definitely not the equal of those high-end lenses others are talking about. But it's fairly small, and light, and unless I misunderstand you, the first place your new rig is going is on a trip. I'd suggest that being able to go to 300 (yes, at a fairly small aperture) will come in very handy while touring.
In the US, its price is a bit more than half of the 24-70's.
I took mine out of the cabinet the other day and mounted it on the D810 because I wanted a one-lens solution for what I was going to do. It did its job. I've never regretted buying it although it's certainly true that if I can take three or four lenses with me, the 28-300 stays home.
But as others have said, I urge you to handle the 750 and 810 both. Sometimes little things prove important. For example, I am very often holding my D810 in my hand, down at my side. The 810's grip is significantly deeper than the D800's, and I really like that because it gives me a firmer, more natural hold on the camera. Another person might not care in the least. You can only find out what suits you (or doesn't) by handling them.
[ edit ] Ah, I see that you're going to wait until after your trip. Therefore my "good for a trip" suggestion is irrelevant.
I'm so, so, not one of those "I have one, so it's great and everybody should buy one" people. Earlier in this thread I laid out its shortcomings -- it's definitely not the equal of those high-end lenses others are talking about. But it's fairly small, and light, and unless I misunderstand you, the first place your new rig is going is on a trip. I'd suggest that being able to go to 300 (yes, at a fairly small aperture) will come in very handy while touring.
In the US, its price is a bit more than half of the 24-70's.
I took mine out of the cabinet the other day and mounted it on the D810 because I wanted a one-lens solution for what I was going to do. It did its job. I've never regretted buying it although it's certainly true that if I can take three or four lenses with me, the 28-300 stays home.
But as others have said, I urge you to handle the 750 and 810 both. Sometimes little things prove important. For example, I am very often holding my D810 in my hand, down at my side. The 810's grip is significantly deeper than the D800's, and I really like that because it gives me a firmer, more natural hold on the camera. Another person might not care in the least. You can only find out what suits you (or doesn't) by handling them.
[ edit ] Ah, I see that you're going to wait until after your trip. Therefore my "good for a trip" suggestion is irrelevant.