Cool Bukkit Plugins?

My friends and i made a server recently and would like some cool plugins ffom bukkit. If anyone has some, feel happy to tell me.
What I Want:
-A ranks system (Ops, Mods, Owners, Guest, Player)
-Spawn setting abilities (set where the main spawn is, not just your own. Only Owners)

Thanks! When the server is released you will be notified and rewarded (maybe in diamonds? Hmmm?)