I gone down this road before......and i brought pentax kx as my first dslr. no regrets so far.
dont worry about what the typical Canikon peopel will tell u ..... "about hard to find lens etc etc".
in one month of owning a pentax I had collected 5 lens covering 18 to 300 mm and a manual prime lens 50mm f1.7.
Go with the Kx dual lens kit 18-55 n 55-200. if you go the pentax path. the lens kit produce good IQ
here a review link.