If I were looking to primarily use for manual focus, I'd get the one with the integrated viewfinder (NEX-7). As someone mostly using AF who is getting used to primarily shooting with a rear LCD for viewing, I personally am looking to get the NEX-5N unless I can find a really great deal on one of the discontinued models (NEX-3 or -5).
I was considering the NEX-5n ... but two things kept bugging me. First, I am CERTAIN that I would buy the EVF for it which adds $350 to the $700 price of the NEX-5n kit ... a total of $1,050.
Second, I know I find it frustrating that my NEX-3 lacks a hotshoe for a "serious" flash with its own batteries and a proper tilt/swivel bounce head. Not only that, but with the EVF mounted the NEX-5n can't use flash at all.
If the choice is a $1,050 camera that can't use flash or a $1,399 ($1,199 body only) camera that not only can use a flash but has several other advantages ... I'll take the $1,399 camera.
If money was no object, I'd go for the NEX-7 as it has many good points. First, it has a built in viewfinder so you have the view that the sensor sees, then, it has a good range of settings making it as good as, if not better control over a DSLR, then it has that superb sensor giving you more detail too. The only cameras in my opinion that would beat it would be full frame cameras. But as I can't afford it, I've ordered the second best choice — the NEX-5N!
I hope they keep both the 5N and the 7 available. I as well am not ready to spend $1000+ for a camera.
One of the attractions to me when I bought my NEX-3 was that for only a couple hundred more I could get a much more capable camera than the point and shoot I had. I had always stayed away from DSLR's in the past because the price was just not worth it to me.
I love the concept of the 7 and love that the compacts are becoming more and more powerful.