What other crew skill can you take? Only Bio. Best PVP gear comes from vendors anyway.
Armortech/Synthweaving/Armstech - you buy BM/WH gear from vendors
Cybertech/Artifice - you get those mods/crystals in the gear bought from vendors
Level Bio to 400, then take 2 gathering skills for moneymaking (UWT/Slicing for example).
Crafting your own crit orange gear with augument slot is nice, but you can just buy it on GTN, ask your friend/guildie craft it for you or level an alt to lvl 10.