You will want your accuracy to at least 100%. It is comparable to "hit" in WoW.
Personally, I prefer Crit over Power, but at lower levels you'll see more pieces with Power. As always, if you will be gimped too much on one stat over another, it may not be worth it.
If you are going to go for Crit, you will always want to have Surge. Surge boosts the damage of your critical attacks. There is a stats guide on the website in my signature for all Primary and Secondary stats.