Your gear is pretty good and your dps seems respectable for a beginner. Shinna is right in that it would be difficult to find upgrades for you with a low budget. If you're having problems staying alive, you may need to consider dropping dps for survivability. I had to do this and used the guide linked below to help me out (my dps took a HUGE hit but I rarely die on low MP now). It helps to unify your resistance (drop the arcane for fire resist). Otherwise, I'm not sure.
Check out this guide on the Blizzard forums:
I found it helpful as a beginner to help me gear with a low budget.