Currently I'm using two 25" monitors set up like the image below.
I'd like to get a 42" - 48" display and mount it to the wall where you see the acoustic foam and maybe use one of the 25" as a 2nd display mounted above or below the new large one.
I'm liking this one  so far. I'm just wondering if anyone has any advice or warnings.
 

 

Hey, you have my PS8s!!  :)
 

If you mean the reference monitors they are actually (very old) Event 20/20 BAS

Yes, mine are also very old Event PS8s ...

I've been using a Samsung 39" HD TV, placed directly in front about 2 to 3 feet away with good result.
 
A 39" - 42" screen placed at this distance,  is as large as you possibly can view comfortably without having to turn your head. Anything larger would have to be placed further away.
 
So, do measure your sitting position to the foam area and test the larger 48" screen at the store with the same distance if it's comfortable too.

tomixornot
I've been using a Samsung 39" HD TV, placed directly in front about 2 to 3 feet away with good result.
 
A 39" - 42" screen placed at this distance,  is as large as you possibly can view comfortably without having to turn your head. Anything larger would have to be placed further away.
 
So, do measure your sitting position to the foam area and test the larger 48" screen at the store with the same distance if it's comfortable too.

That's a good point Albert and the kind of advice I was looking for.
The wall is just under 6 feet away when I'm sitting in the sweet spot (triangle with ref monitors).
That said, I've decided to buy the 48" model mentioned above but swap it out with the 40" we have in the living room....kinda like 2 upgrades in one 
Thanks for the help,
Randy
 

I use the Samsung 42".
I did try with a 55" but ended up looking all over the place...

 

I use the Samsung 42".
 
That is a SWEET setup!
 
I did try with a 55" but ended up looking all over the place...
 
I consider that a good problem to have (if you're going to have a problem) but I will take the advice here and go with the 40" in our living room.
I can't see the placement of your ref monitors, how far away to you have to sit from your display.
One thing I'm going to dig is being able to lower my ref monitors a few inches to comfortably be in the sweet spot.
As it is now I have to raise my office chair all the way up and sit up as straight as I can to get up to their level.

All is saw in the thread title was: advice on big-ass display
 
 
(I was going to suggest dieting......)

Those 20/20's are nice I have a set of pre Bas ones i.e. Passive