lol, I would say PKD and Ozone just because I know the kites so well, but I also know the the new ranges from Flexi are good but I havent flown them so cant recommend them from an experienced point of view. There is also HQ, they seem to be making better kites now but again, only flown the Crossfires and I wouldnt recommend it as a second kite...more of an advanced kite.
Plenty of good brands out there
The larger PKD Buster IIs are good kites, so are the PKD Brooza's and for very good prices, the Ozone Fury or Samurai again are both very good buggy engines, as Paul said, if you are looking to get in to freestyle then maybe a Blade or Ozone Riot (be careful!). Something in the 5m range would do you nicely, and then you will start to ask, "What kite to do me when the 5m is too much but the 2m isnt enough

Before you know it you will have *cough* a lot of kites
O.