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That looks pretty good.

I'd add that Dark/Ice makes a fairly good tanktroller build, much the same as Dark/Stone does. Ice adds no specific synergies, which means that you're probably free to postpone the costlier or more dangerous auras, but you can muster at least a little of almost every debuff or control in the game: hold, slow, fear, -tohit, immobilize, knockdown, stun. Throw in Confuse and you have the whole package. You aren't going to incapacitate bosses this way but you can lock down many minions most of the time.

I grew frustrated on mine, though, probably too soon. The build works fine against a whole lot of content, but is deeply sub-optimal on the ITF because of the control resistance of the Roman Yell, and about half the time my 35+ characters are running ITFs. So the inherent squishiness of a resist based set came to the foreground, and the advantages of the character were lost on frequently encountered mobs. I took a free server move and hopped the character over to Champion, where I hope to level her to 50.