I find it very interesting that recharge is so good in silver since I've had trouble using it effectively. And I'm also puzzled with Dispel since I haven't paid any mind to it ever.
Either way, it's a great analysis. Thank you for posting all of these statistics. They're quite helpful!
I have the same experience with recharge, but there must be some of them that are in fact pretty good. My bet is on the magic rechargers, since they dont have an issue with misses or armor (most of the time).