Re: 2000$ to spend on a new hookah
Get a Medium Phunnel bowl for sure! Height does not affect smoke quality for the most part, between 26" and 35" is just the same; the difference form those heights is just pull and warmth of smoke anyway.
All KM's pull the same, they are all designed the same on the inside as well. So they all smoke relatively the same. Small differences in build may affect certain aspects.
I would very highly recommend a KM for you, I would go for any rig you like the look of.