Rune arm crafting thoughts?

So, reading the latest blogs by Samius has reminded me of something.

I have a level 20 artificer, Othala, who I think may actually be my favourite character. I know everyone says arties don’t do good damage, but I’m seeing decent numbers off him, and lots of them. I also seem to have picked up quite a few good rune arms. My most used are Glorious Obscenity and Lucid Dreams.

What I haven’t done is taken advantage of the crafting. So, while I will be researching this myself – does anybody out there have any suggestions of what’s best to add to a rune arm? As I understand it, once it’s on there, it cannot some off, so I guess I need to choose wisely!