Re: hey everybody- need some advice with a hookah
KM's are awesome, i'd say anywhere between 20-36", any bigger and it becomes more of a burden to use, clean, etc.
Bowls, I would say go with either a funnel or vortex bowl, they are amazing.
As far as hoses, KM hoses are good quality and normally come with the hookah on most sites.
If you're going for high quality, I'd say stay away from non-brand names, some are awesome, but sometimes you can get a real lemon.