Fortunately, there are tools out there to help that out somewhat. The latest tool being Chardev.org, a website that allows you to either build a character from the ground up or import yours from the Armory. Everything from gems to enchants to talents are able to be altered here, and while this isn't the first website to do something like that, it does do something differently. It allows you to see all of your stats, and the breakdown of your spells. Their damage, damage coefficients, casting time after Haste, all of that.
It definitely isn't perfect or a replacement for good math, but it's quality work regardless. The ability to refine your item searches further would help a lot. As it is right now, it just throws you a giant list of what could technically go in that slot, with no way to narrow it down. Still, seeing spell stats and how gear will affect them laid out for you is very cool. Chardev is worth at least a look!
[ via Massively ]