Re: stainless steel
It's all about looks man. If you like the simplicity of the stainless, go with it. If you want a bitchin' sweet flashy trimetal, it'll perform the same.
I believe all the KM hookahs now have stainless inner stems. I have an older Pharonie with a copper one, but it shouldn't make much of a difference (Although I'd swear the copper smokes cooler.)
Darth Coyote, Executor of EGOB and the Black Leaf Brotherhood.