I'd go for something a little bigger than a micro because it looks as though you learn fast

Why does it have to be a PZ plane? there are loads of different makes out there that are just as good sometimes even better but won't cost as much.

Try a AXN floater/jet or the Bixler both from Hobbyking.com and both planes would suite you,the AXN has a huge following and if you go over to YouTube and type in ANX floater you will see loads of good videos on how good a plane this is,plus you will be able to do the easier sort of tricks like loops barrel rolls and so on,if flies slow and fast so you won't get board with it to quickly.

Just my two pennies worth but at the end of the day the choice is yours and i hope you enjoy what ever plane you pick.