well 22 is the max size for me, anything bigger isn't great for crashing on (i crash my ride A LOT)Haven't tried the 23" but used to have a 21" that I liked while I had it. Everybody else is right about keeping the size of your cymbal case/bag in mind, though. Having to buy a bigger bag may not be practical. I learned that the hard way, LOL.
Good luck with whatever you choose!