I'm kind of leaning towards the stam as well. With 5 points that'll give you a good 1300-1500hp depending on your stats.

I guess I need to study things a bit more but I feel like astral shift doesn't really keep me alive. I usually die from burst when I'm not CC'd at all.

When we fight teams with mediocre gear, everyone has about an average of 23k hp. The mages might have 19.5k, warriors and hunters up to 27k. Mine are all 19k or less... which is pretty sad.