My very comfortable cutting table top is right below my belly button, if that's any help. I measure where my elbow comes, and the table top is about 2 inches below that. I think if the table were any higher, it would be difficult for me to cut 22" of fabric at a time.
I like to sew and quilt standing up, so am in the process of making a foam insulation "table" for my machine. This will go on top of my cutting table and should be perfect for me (surface will be just slightly above my elbow height). I have found that I can machine quilt much longer standing up than I can sitting down, and I do not develop the lower back pain and tightness between the shoulder blades that used to plague me when I sat down to sew for too long at a time.