Hardshell kayaking in Colorado: dry-suit all the way ; anything else is a temporary substitute. Roll and brace to cool off as needed. Shed under layers as needed, etc. You might even be called upon to dive in and rescue a friend or random swimmer, at which point, you'll quickly forget how hot your drysuit is. Not to mention, most of our playboating is freaking cold, especially if you try to dodge crowds in the morning in Golden. If you're getting too hot playboating in a drysuit, it's probably because you're spending too much time in an eddy, waiting for your turn. (With that said, there are very hot days during playboating throughout the year and depending on where you go and the situation, a drysuit is impractical. Having a drysuit just means you can get sweet play-sessions in BV, early spring, among other things)
My current dry suit has pin-holes or something, so I'm using neoprene and jacket right now mostly. Still though, willing to use my drysuit and always have it handy. It being a little leaky hasn't been the end of the world. If I end up replacing it, I might turn it into a dry-top.
ps. I have a size or two too-big on the dry-suit. It's never been a problem. Might have to burp the suit more than usual, but I wouldn't know. It was on clearance, what can I say?
pps. gaskets are meant to be cut to size. If you're having trouble breathing, getting light headed, face turning purple at the end of trips, etc, it's imperative you cut the gasket down. You don't want to be on the brink of unconsciousness when you flip over, hit your helmet on rock, etc.