Hi Frenchy,
I was in a similar situation as you few weeks ago. The only difference is that i've flown foil land kites with a landboard for couple of years, and finally managed to transition into kitesurfing. As the other guys said, you won't regret taking some lessons where you'll figure out answers to most of your questions. I've personally flown Hybrid kites while doing the lessons, but afterwards i bought a 13m fuel C (slingshot) kite iwth 5th fully depowerable line. The 5th line can be very useful if you loose control or crash your kite downwind because you can fully depower and reach your kite without it turning in circles endlessly and twisting your lines. So far i'm totally impressed with the kite. Also, most kiters use waist harness, but as a beginner i found seat harness easier, because until you are more experienced, you can end up with the kite pulling your waist harness up and it can get uncomfortable around the chest area. I've picked up a new one for $200, but i suppose once you move to a waist harness you can just sell the old one on ebay.
And finally, I don't think getting fully addicted is avoidable