It really depends on what you can find the most use out of. Wether your gold starved, and wether you just want some cool gadgets. Eng is fun, but its a pain to make any type of gold off of it. Theo has a post that tells you all about the professions. I highly suggest reading anything he has posted. Its all good. I've been on my rogue for two years now and he put some stuff in there I have never actually thought about.