How many players on your server? If it's a small server, use CraftBukkit. If you have a lot of players, Spigot can be more efficient.
Here's a current view of what everyone is using server and plugin wise. I use it to find popular plugins that I might have missed. http://www.mcstats.org/global/ You need to be sure you have craftbukkit and spigot built recently. There are other "1.8" versions built last august which are incompatible with plugins compiled for "1.8" today.