I need some advice on the 2012 vector

I'm looking to buy my first kite and I'm just going for a single kite until my bank balance recovers.. Due to this kite being pretty forgiving and somewhat underpowered by all accounts, I was tossing up between an 11 or 12 (I'm 92kg) to accomodate the 15-25kn range (Perth metro).
To anyone who's flown these kites, does the 12 seem like a reasonable choice or is this going to force me to sit out in 25kn conditions? Would I be better off going down to an 11 to get a better wind range to get me out more often? I've been told that the depower system is so good on the vector you can easily make the 12 behave like a 10, but I find this idea a little hard to believe.
The plan is to add a 9 down the track when I can afford it to round things out.
Thanks in advance! :)