D90 to D600 Upgrade Question

Just a question regarding the differences anybody experienced going from a D90 to a D600? Mainly the autofocus points, ISO performance and just general observations.

Here's my background. I've owned a D90 since early 2010. It was my first DSLR and I don't feel like I've outgrown it yet but a couple of things are getting to me when I shoot. I'm always shooting in full manual mode with single point AF but I find having 11 focus points a bit limiting. I'm not a fan of "focus and recompose" so I end up shooting my subject slightly off from where I want it in the frame so it lands on a focus point and then doing a bit of cropping to push the subject to where I want it in the frame. I recently handled a D800 and a D600 and the first thing I noticed on the D600 is how condensed the autofocus points were in the viewfinder. It actually bothered me as I'm used to having the focus points nearly cover the frame on my D90. Is this really an issue for anybody going from a D90 to a D600? Is it leaps and bounds better than the D90 in everyday performance? I also feel limited in ISO performance. I try not to go over ISO 1250 but I may occasionally push it to 1600. How's ISO performance on the D600?

Now my other option is the D800 but I'm reserved on the price. I wish they had released a version without a video mode or perhaps less pixels in order to bring the price down. I don't feel like I need that many pixels and I don't recall ever shooting a video in my life. It's not my cup of tea. But what has my attention is the better focusing system, the bigger focus area and lastly the weight. I know people don't like heavy cameras but I own the Nikon 14-24/2.8 and the Nikon 24-70/2.8. They definitely feel front heavy on my D90 and when I handled the D800 with those lenses attached it felt nice and balanced. But, I just feel like the D800 is more camera than I need - at least on paper. Money isn't an issue but I also don't like spending it on things I don't feel are necessary.

Okay that was a lot. By the way, photography is just a hobby for me. I don't have a specific style. I tend to shoot events where I'm a guest (not sports), architecture and landscapes. I hope that helps.