We looked at everything from 16 to 25.
TV was not an issue.
In the end we got a 22.
Can't tell you how much we like it.
I resisted at first, because I really like the dinette in the front pano windows, and the 22 does not have that.
But it has The largest bed (80" long), bathroom with a window that opens and room to stand at the sink, a long spanse of kitchen counter for a very workable kitchen, and comfy dinette.
The info that helped us decide was realizing via the Colonial AS long video that the table could be rotated 90 degrees when sitting so that the short end is under the window.
And the narrower width makes towing much easier as far as visibility and parking.
Couple all of that with the great (for an AS) price point and we feel we got a great unit we can use for the 2 of us and the dog, and bring along a grown kid if they wanted to come as well.