The classes you mentioned are all a different play style. What tpye of fighting do you like to do?
In brief:
The SwS is a melee fighter that helps his group with def. buffs
The TK is a Tank melee type that takes damage well, but is not the best at giving damage.
The SR is a ranged attack (archer) that can not take too many hits, but gives alot of damage.
The PW is a dagger using melee character that gives alot of damage but does not take it too well.
Will you be playing with friends alot, or are you more into soloing?
If you like dooing damage, there are 2 alternatives:
Silver Ranger
Plains Walker
A silver ranger is an archer, and is the only archer without any life to mana skill. A fast shooter, a fast runner, but not the strongest of the archer.
A plains walker is a dagger user, someone that likes to backstabb people and get up close. Has more skills than the archer, but does less damage straight up unless your skills hit.
If u like taking damage its either Swordsinger or Temple Knight:
Swordsinger is a melee buffer that buffs with mostly defensive songs, it also gets tanking skills and heavy armor masteries up to lvl 36, so it can take some damage, but is mostly a buffer that helps out with dooing as much damage as possible.
The temple knight is a tank with defensive skills just like any other tank. The bad thing about a temple knight is that it does not have the offensive skills other tanks have, or the grouping skills some others have.