Yikes. How are you guys getting energy credits? Buying stuff to fulfill reputation projects has left me broke.
Ker'rat lv50, blow up the Repair Cubes.
Only problem is you usually get Klings annoying the crap out of you, yesterday I did just fine as many Rommys are doing Ker'rat and its even better as the Borg are not firing on Romulan players unless you fire on then.
What you want is Engines, Deflectors and Shields and sell then to ESD/First City bartenders as they pay 50% of base price (best seller price), that means 100k on Mk XI shields.