I get the wish for a big TV, but realistically, you have to look at what your budget offers combined with the aesthetics which you are very determined to preserve in the space you are in.
This pushes a great deal of change in what you are allowed to do within the constraints of your budget and it seems like you are running around in circles trying to avoid those constraints.
1. You aren't going to get front projection unless you are seriously giong to do light control in the room. A Carada brilliant white screen can be awesome - as can motorized screens from Draper or Dalite, but without light control, it just isn't worth it.
2. Your best bang for the buck is going to come from a quality rear projection television, but at that size, you are going to be limited to just a few quality RPTVs. Mitsubishi is way up there in the lineup... But, if you dont' want the box in the room, you get a bit more limited. Keep in mind - for NOT a lot of money you could likely build out a false wall (drywall) and just have a nook for the TV to slide into. Not as nice as wood cabinets, but far less money and a space that fits.
3. The best option sits sqarely in the LCD and plasma domain. But, once again, this starts off with a higher price point. You either suck it up, or walk away from that price point... Or maybe make a bit of a concession. If you do a fair amount of non-HD viewing, then consider the dual format route of getting a slightly lesser HDTV and then working to mate it with a front projector for after dark viewing. The 60" Pioneer PDP-6010FD can be had for under $5,000 and is phenomenal across the board... Likewise the Panasonic TH-58PZ700U 58-inch 1080p Plasma HDTV has received high raves. This is 5" and 7" smaller than what you want, but will deliver aesthetics as well as top shelf viewing for all types of material.
Then come back in a year or so and ADD to the setup with a motorized screen and a front projection setup for after dark viewing.
I've been running both FP and plasma in my home for 4+ years now. I was just using front projection but couldn't stand the ambient light issues, then I added a 50" Sampo plasma a few years ago, and watched that almost as much as the projector... Just recently upgraded to a 60" Pioneer, and we now tend to watch that as much, or more, than the projector. It's simply a phenomenal image. Yet, the projector is always there for movies on Blu-ray or some HD sports or prime time shows. The best part, is the ability to build into what you want to do while maintaining both.
Then you get the motorized screen that fits into the space as best possible - and as biggest possible, potentially getting a full 80+ inches of screen, and because it's motorized it's up and completely out of the way when not in use.