Its true you save a little money with the bundle deals. Personally, comparing the savings of a bundle to the complete customization you get from piecing it together yourself, I prefer the customization. As a previous responder mentioned, not a fan of the microATX board.
About the PSU and future proofing for a second 570, this an approximation so you shouldn't take these numbers literally:
TDP of an OC'd 570 is roughly 250W. So, if you're thinking SLi in the future, 500W for the 570 OC SLi setup alone.
2600K OC maybe 120W.
Miscellaneous: ram, drives, extra fans, another 50W.
Best case scenario if the PSU is actually able to put out 760W (I don't know if this holds true), it would work out.
The 2600K makes sense for your 3ds Max use.
As far as screen real estate goes, 1680x1050 to 1920x1080 wouldn't be a big jump, its like 0.3 megapixels difference. If you just want a larger screen it might be worthwhile, but I would probably go with a jump to 1920x1200 at minimum , keeping the 16:10 ratio.
Good luck, whatever you decide.