Where to go from here?

Hey guys. First time with a ST Scion. I've followed builds but done my own branching out just slightly. I've not hit a big curtain yet, but I'm just looking for some advice.

I've been farming Merv for the past two days working on my upgrades (finally got multistrike and could do her :P)

Gear:

What would you recommend I spend my immediate time into upgrading first?

Any help?

Hi