Here's the second half of my Dire Avenger squad, which includes the Exarch with power weapon and shimmershield. Here are the normal aspect warriors.
And here's the Exarch. I have to say that the power weapon and shimmershield armament makes the best looking Exarch, regardless of his abilities on the table.
I know Exarchs aren't the most efficient choices for Eldar, but I think the Eldar codex is strong enough (at least at the level that I play at), that I can take some less efficient choices and still have a good game. Plus, I built my squads with Exarchs and they look awesome.