energy for sure. it may look bad now, but itll pay off later. and also, put all 5 rank points into decks (maybe occasionally putting 1 into cargo) if you're not already

energy planetary structures and weapons, and get your engineers up to 125 and then put points into decks.

I was gonna say ENERGY but...... research- research, you gonna want to do some planetary structure research so you can build better research structures on research rich planets ........ then you'll have more RP to research ENERGY

As a priority:
Energy - More energy = more missions = more exp = more ranks = more planets = more production.
Weapons - at least to lvl2 as a PvP deterrent.
Planets - lvl 2 gives you modules which give +2 resources for a little less space, giving you more research per hour (plus others), letting you research more stuff.

I'd say in that order too - I'm rank 65 now, and I "tier researched" (i.e. all the 600pts ones together, then the next lot) until about rank 20. Then I had to go far more into weapons and energy than the others.

Scans are the least of your worries - I'd go no higher than tier 3 until around rank 20.

By the look of your tree I'm guessing your an Aerlean?

energy or weapons

Wow, 32 research per hour and almost empty research tree. I've forgotten what it was like to be that low level.