If u r gg to be a pro, i would suggest u stick to C & N.
cos pentax is more for the enthusiast and ppl who r not into the mainstream or probably they juz like pentax.
its got slower AF, no anti shake. dun really have a fast lens beyond 200mm...probly no bty pack for the DS.
it only have a bright viewfinder, small n light body, small & beautiful lens(esp the primes) & backward compatiblilty.
if u r into sports photography, the DS is most probly not the cam for u as well cos it does not have AFC in other modes other than SPORTS.
btw the 2 cams. biggest diff is probly the viewfinder, startup time, the size, the MLU in DS and ISO 3200, shd be usable if the output is similar to D.
but 300D do have the portrait grip n bty pack and u can upgrade to e PRO series.
not sure abt the rest. but u can read up.
anyway the 300D is a good cam. (my office got 1. its juz tat i dun like it.)
better yet, get the D70. seems like a good 1 and the price is falling.
u juz need a good eye for good pics.
the AF360FGZ shd be ard 350 including GST from CP.
info on the specs n accessories can be found here.
http://www.digital.pentax.co.jp/en/index.php
a more active forum w pics from Ist D & DS and output from various lens can be found here.
http://www.cameraunion.net/forum/showthread.php?threadid=174911
http://forums.dpreview.com/forums/forum.asp?forum=1036