In beta I went Cybertech/Scav/UT. Enjoyed Cybertech, crated weapon/armor modifications aswell as upgrades/gear for droid companions. Interestingly, the item rating level actually increases with the modifications you put in them. I had a rating 28 blaster pistol ,and fully upgraded it with blue mods i made/bought and it ended up lv 50. You can also get some mods which add extra bonuses, like raw weapon dmg etc. I can see it being potentially lucrative, as I think most people will go for gear or weapon crafting.