My only advice is what my co worker told me when I was looking. Get the biggest one you can. I was looking at no bigger than 46" (going from a 25" conventional) and I ended up getting a 52". Super happy that I did. If I upgrade from this one I will be getting an 80", but only if they are way cheaper than they are now.
_________________________
...
Propping up an obsolete fishing industry at the expense of sound fisheries management is irresponsible. -Sg