I've decided I'm going to go with an 8.4" 800x600 LCD, from eVision Displays.
I got a quote for the LCD panel, at $428, detailed in this thread:
The panel mentioned in the other thread is the replacement model of the LCD I mentioned earlier in this thread - the new one is brighter, I believe.
Total cost for 1 LCD + all the parts was about $511.
In any case, now that I've settled on an LCD, I started figuring out how to mount the LCD to the front of the case - with brackets.
The brackets mount to the front of the case, at the edges, and flare out to match the width of the LCD panel frame.
The brackets, when bent, extend out about 20mm.
The bracket for the right side of the LCD is bent at 90 degrees, and the bracket for the left side is angled out at about 15 degrees.
The left side border of the LCD panel is wider than the right side, so the bracket needs to bend out farther to reach the edge.
About the pics:
In pic 1, flip the outer edges of the brackets up, and then rotate down to get some idea on how they mount.
In pic 2, flip the outer edges up, and then you'll have the front-on view, or what the brackets would look like just behind the LCD panel.
The brackets will be drilled & tapped for mounting holes - the brackets will screw to the front of the case, and the LCD will get screwed to the brackets, through the mounting holes on the LCD frame itself.
The actual dimensions of the brackets aren't currently 100% yet, as I have to make them equal height.. in progress.