5x7 is exactly the enlarge size I have printed so far. And I like small prints because they look charming, expecially in a chunck frame.
I got 7x9 Ilford Art 300 because I didn't find on the size 5x7. I didn't start print on it yet because I still have to find largers tanks to to fit the paper in for developing, stop, fix, wash, toning. The ones I have fit exactly 5x7 papers size.
But I just thought now about to cut the paper in a half so I will have 3.5x5.5 in print size.