To add more perspective to the table, can i share my thoughts?
I got my k-x last week from OP, and i too at first wanted the dual lens kit.. thought it will save me some cash to get it as a set.
But in the end, no news (as of last week) that emjay will bring in the dual lens kit, so i went with fellow brothers' recommendation to get the single len kit first den buy separately if needed.
Boy, 1 week later, i am quite glad i didn't get the dual lens kit, cos i realised that i am a all-in-one zoom user after all... I borrowed my cousin's Nikon D90 to try for a few days (she used a 18-200mm zoom), and once i got the k-x kit lens, i realised that i liked the all in one option, better than to use 2 lenses of 18-55 and 50-200. Cos i carry my k-x with me all the time, i dun want to bother much with changing lens all the time.
I got a 28-200 off 2nd hand here in the end =) very happy with it so far.
Just want to share with other newbies that if you're like me, you might prefer to save on the dual kit lens and buy a all-in-1 instead. =) Better yet, some brothers here are eyeing the extra lens haha...
Cheers!