You could go
here and do some brainstorming/mapping. I think if you're going to decide to do Daedric Summoning and Two handed weapons I might focus on medium armor where you will get the most damage out of your two handed abilities. However, if you just want to be tanky then I might go 1 hand/shield instead of two handed. I did a build in one of the betas with 1hand/shield, Daedric Summoning, and Storm Calling to get the damage reduction/damage active and the armor abilities and shields from summoning and I was a beast when it came to being tanky. It was also a lot of fun.
I think for release I'm going to do a Nightblade that focuses on bow/resto staff as my two weapon types and be a really annoying healer type. I feel like a healer with a lot of escape abilities could be pretty decent. I'll probably focus on the Siphoning/Shadow Trees at first, and I have no idea what I will do from there.