Re: best hookah head to buy?
Stick with the basic Egyptian until you master it. Then you can move on to other styles. I would suggest a vortex for the most part. It behaves well with most tobaccos whether they be wet or dry and does not come with the foil complaints that many have regarding the funnel.
Personally, I am a bigger fan of the funnel but it's huge and more expensive. Even the small is massive. You are paying for a hand made and carefully crafted piece rather than something mass produced. I have found that for Tangiers this is the best bowl. The heat capacity of the thick clay is great and works wonderfully for me.
Stay away fro multi-head bowls. They are a gimmick and pretty terrible.
Really though, a standard Egyptian bowl will treat you nicely for a long time and is damn versatile.