First choice a B series, bit more expensive but SO MUCH kite.
Second choice, cheaper, easy to learn on, EXP.
BEST choice, get BOTH the B series, standard and vented. You will never NEED to buy another Rev, of course you will WANT to buy others, just cuz they are SOOO adictive.
BEST CHOICE OF ALL, get at least 3 of each of them from EXP through the speed sreies and all the Masterpiec'es. Then you can REALLY push the boat out with some FINE stacks, progressive stacks etc, and be THE ENVY of ALL.
Hope this helps.