Best tolerated ssri's would be zoloft or lexapro followed by celexa and prozac but try paxil last as it can be hard to come off but not so bad if done right(slow tapper). Same for effexor.
Any benzo but xanax as I just think it should be used for very bad panic or specific phobias with it's shorter half life. Others are less likely to cause dependance but they all with work well for anxiety/panic at the right dose. Longer acting ones just seem be less habit forming IMHO. With all meds each will get different results and 2 months would be a minimum trial length for an AD(unless the sides are horrible). Alankay