"I am puzzled. I have an image that says it's at 240 dpi ( default out of the Canon 5D2) -- which is a nice printing resolution, correct?

and the size was taken at:  2784 x 1856 pixels.

The w x h is: 11.6 x 7.33"

You must be using a lower resolution in camera jpeg. The default resolution for the 5d2 is 3744 x 5616 pixels.

"On my monitor at 100% it looks terrific on my 27" at all edges of the screen. As I go to 200% things start looking pixilated and bad."

At 100 percent, the image should be  just slightly larger than your screen, and of course, if you view at 200%, you image will start to look pixelated. That's normal.

"But I would assume at 100% things would start looking bad over 11x6 inches on my screen, yet it look good at all edges of the 27" screen."

You're assuming that your screen has the same resolution as your print. It does not. Your file is 240 pixels per inch. Your screen is somewhere around 100 pixels per inch ( you'll have to do the actual math, y'know, screen width in inches divided by pixels displayed, to know for sure). Your screen is approximately 2560 pixels across and you file is 2784, so, at 100% viewing, your file will fill the entire screen and a little more, so, yes, it should look great there. The size of the file on your screen has no bearing of the size of the print. You have to know how many pixels you screen displays vs how many pixels are in the file. The size in print is set by how far you spread those pixels.

"Hope that was clear what I'm asking."

Maybe, sort of.

" I go by what I'm seeing on the screen as an apporoximation of what I would get in quality in a print of about the same size, granted that I'm looking at the image at 100% at a print size dpi of 240 to 300?"

There are a lot of variables - what kind of printer, the quality of the image in the file. After you make a few prints, you'll be able to better correlate what you see on screen compared to what you get in print.

"thanks PDF, I shot in raw but accidentally set it to Raw 2 or 1 thinking that was the highest setting. Live and learn."

I guess that'll teach you. Unless you're damned sure you're never going to need the resolution, I would never use anything but standard RAW.

Ok, so don't think what I'm seeing on my screen, even at highest setting Raw, expanded to 200 or 300% is what a print will look like, in short?"

I'm still confused what you think you should be seeing or how it's different from what you expect. It also sounds like you're not quite getting that the size of the image on screen has nothing to do with the size of the print. You need to start thinking in pixel dimensions and understanding the relationship between file pixels, screen pixels and print pixels. And that's not even broaching the subject of screen color matching print color.

For the record, I've made prints from a 5DMK2 up to 40 x 60 inches and they looked quite nice, as long as you weren't right on top of them while viewing. You should be able to do the same, and even with your lower resolution versions, you can go bigger than you think. You can easily get by with just 180 dpi at final print size and your prints will look fantastic. With careful uprezzing and sharpening, you can go larger as well.

Unless you state the purpose of your printing, your printer, size of print, and paper type, there's no point in pursuing this.

You are aware that you should use image and printer profiles?  And that your monitor should be calibrated?