Well, you have a few options... Kayfun, Genesis-style, Taifun, Fogger, and Expromiser. Each style has pluses and minuses. I can't vouch for the the Fogger or Expromizer, but I've heard good things about them. The Taifun produces great flavor, but is a little light on vapor production and has sort-of a tight draw... no air flow control. Genny's have good flavor and vapor, but can be tricky to build if you use SS mesh. The air flow on a genny is usually controled by drilling out the air holes unless you get a higher-end device like the Prometheus, which does have adjustable air flow. My personal favorite is the Kayfun or Russian. Relatively easy to build, great flavor and adjustable air flow on the Russian 91% or Kayfun lite+.