I have a 23", and unless you're regularly cooking very large amounts, or you just want a 32", the 23" is extremely capable and versitile. I cook 8-10, 1 1/2" ribeyes regularly on the lower grill, which is smaller than the main, plus you have the reversible grill that can either sit directly on the firebox, or on the main, giving you an upper level. It's way more usable and functional than other grills its size, personally I think it's just right.
Robert