If you're ONLY going to shoot macro and landscape, I think any of the bodies will be fine. Landscape won't require fast tracking, big buffer etc. I think those are all 24mp or so, image quality will be similar enough to not notice a difference. For a long time, I edited d800 images on a 2011 or 2012 MBP with integrated graphics card. Obviously more expensive computers will be quicker but to say you can't edit on your current MB would be silly and a lie. As far as lens choices, that'd be a better question for anyone else that currently shoots macro/landscape on DX bodies. I use a 15-30mm on FX and it's amazing but I can't imagine it's wide enough on DX. For macro, my Tamron 90mm is great. I know I've heard of people saying some Tokina's are good like the 100mm macro and I think they have a DX ultra wide too but I haven't personally used them so I can't recommend them.
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I was referring to aroy's two paths
macro/landscape or wildlife but I also want to do street/building, night time, and black & white style