well the belt would be the way to go. its more stable and flys better out of the box than the king2. i do however have more affection for my king2. once you get the right parts for the king2 its flys better and is more agile. the king2 will cost more than the belt once you get the blushess motor and esc. plus the lipo cause the 1000mah wont cut it for long with a more powerful motor. you could also get a better motor than esky. but if you're on a budget than get the esky 3800kv for the king2. i was very pleased with the esky 3800kv motor on my king.
here's a vid me flying the hbk2 at week 9 into the hobby.
http://www.youtube.com/watch?v=LrqSOCSz5og
and here she is all blinged out with led's
http://www.youtube.com/watch?v=obr6AAWUG8Q