I'm definitely buying the NX and I'm fine with 720p with 60fps. I'm sure less technical heavy games will run at 1080p.

1080p and 60 fps at max details!!

What...? Why are you looking at me?

I guess I would choose 720p with better detail. Of course I would rather have 8k with ultra-realistic faces.

XBox One is considerably more powerful than a Tegra X1/X2 and that doesn't manage to hit 1080P in a lot of cases, so it's probably not realistic to expect from NX. 

540-600p for portable mode and 720p for home mode for more demanding visual games probably is more realistic for NX. 

We have very different definitions of "looking great".

Most Wii U games don't have much in the way of clutter or small details, graphically it's almost an entire generation behind.

And if we are going to have better looking games on the NX, then expect 720P. - It simply does not have the capability for much more than that, older games and ports and simple titles will obviously likely be 1080P which is what we are seeing on Nintendo's competitors devices... But hardware pushing titles? Please. - If the Xbox One and Playstation 4 which on a technical level are superior platforms... And they can't do it, then the NX won't either, it's really that simple.

Zelda Breath of the Wild, whilst having some great art, does not have high-end graphics, heck you can even see the limitations in the cherry picked video and pictures meant to show off it's "best side". - With that said, I am still 'keen as' to play it.

Star Fox looked extremely simplistic, mostly thanks to it's 60fps framerate (Which wasn't stable, it fluctuated allot) but responsive gameplay was important for that title, not graphics.

Yes it seems we have.

I don't agree at all that Wii U games are whole generations behind.

I am very pleased how Nintendo Wii U games look, so just Wii U games in 1080p with AA and some smaler improvements and I would be satisfied.

Zelda BotW is beautiful looking game despite don't have high-end graphics.

If the NX could maintain this gap between it and the current next-gen consoles, I'd be relatively ok with that. This is that Unreal Engine 4 demo on PS4 Vs. Tegra X1:

https://www.youtube.com/watch?v=9XzIZWO1qdg

Yes the Tegra X1 version here clearly is lacking some of the effects and details of the PS4 version, but it is essentially the same scene. Keep in mind too the X1 footage is recorded off screen by a cell phone camera, so its kind of an unfair comparison towards the X1, but you get the idea. 

And y'know, doubling the memory bandwidth, improving the CPU, and the moderate spec bump X1 gets from going to X2 could close this gap a bit further too. 

But this is assuming Nintendo pushes the Tegra tech to its maximum, which is yet to be determined as well. 

Whether it does 1080 or 720, considering the specs will be underwhelming next to the X1 and PS4, minus no BR player and possibly very little HDD storage, what is the most people will be willing to pay for it?

I'll find it hard to justify paying £250-300 if i can pick up a PS4S or X1S at that price.

At this point in time releasing a next gen console under 1080p seems crazy. Hope it's portable aspect carries it over.

720p and better effects all the way. I honestly don't mind the resolution as long as it doesn't drop beneath HD in 'home console mode'.
I wouldn't even mind 540p on the go if it meant freeing up additional power for the graphics. As long as the NX has a good quality panel that is not too large smaller resolutions will still look good on the go.