As others have said, your best bet is to sub for a month (if possible) and try them all out. On top of giving you a chance to give them all a whirl (preventing the chance of you making a purchase you are, in the end, unhappy with), it will also unlock all your trait slots which will be one less cost for you down the line.
[center][color=#CC3300]Lieutenant Sersi Niflhel[/color] [color=#666699]· [i]Retired[/i][/color]
[color=#993333]"I will give you no quarter, and I will take none."[/color][/center]