Drobots in Need?: What are the best Skylanders?

So, I got this game this week and want to know what are some of the best either new Skylanders, Skylanders Giants or Old Skylanders. I will be doing some kind of content with all this stuff and would love to know if I need the level packs as well. oh btw, Jeff Gertsmann from Giantbomb has made me getting Drobot a given. ITS a DRAGON ROBOT.