[Orangeair]

+1 for this. I actually just set up similar myself yesterday. Once you look at a few tutorials and figure out how to muck around with all the yaml config files, it's really pretty easy to configure bungeecord. The isolation you get from being in completely separate worlds is definitely an added bonus. You can do cool things like create worlds that are entirely devoted to a minigame, for instance, if you want to have that. It also makes it really easy to just create one hub world that players can teleport from, and return to easily. I used a really simple plugin called FancyPortals[0] to achieve that. There are a couple potential problems you may face, the biggest one being memory requirements (since you would actually be running n servers instead of just one). If that's the case, you could also check out MultiVerse[1], which is a bit easier on memory I believe.

If nothing else, you should at least consider switching over to Spigot[2] (A high performance fork of Bukkit). They've had some DMCA problems, so you have to compile the .jar yourself, but there's a script which automates the entire process, so that's really no big deal. Plus they just updated to 1.8 yesterday! Once you have Spigot, you can use any Bukkit plugin. Plugins exist that do everything you're trying to do, and more, but with the added bonus of actually being integrated into the game. The big one to check out would be Essentials[3], which contains dozen of simple commands for doing lots of common, neat things.

[0] http://dev.bukkit.org/bukkit-plugins/fancyportals/

[1] http://dev.bukkit.org/bukkit-plugins/multiverse-core/

[2] http://www.spigotmc.org/threads/bukkit-craftbukkit-spigot-1-...

[3] http://dev.bukkit.org/bukkit-plugins/essentials/