Pentax only has a 50/1.4 at ~$546. It is of a better build quality and faster (f1.4) than the 50/1.8s that you mentioned.
There are loads of manual focus 50/1.4, 50/1.7(~$120), 50/2 (~$65) in the 2nd hand market if you do not mind manual focusing (in which again, Pentax does offer AF confirmation).
The other options are the FA35/2 (~$700+) or the Sigma 30/1.4 ($750)
The high ISO performance of the Kx will help you for indoor shots, but I would advise you to more importantly learn how to take advantage of available light (eg. window light ). Large aperture lenses (any brand) of any type is a double edged sword. It allows you to shoot in lower light conditions, but the shallower depth of field can mean more missed/blur/OOF shots.
As for Pentax user base. You can check out the sub-forum yourself
http://www.clubsnap.com/forums/forumdisplay.php?f=76
There is always a monthly gathering for chit chat, sharing and photography. This has been one of the long and consistent brand based user gatherings on CS, though users of other brands are welcome as well (there are a few regulars in fact). There will be one on the 14thAug
http://www.clubsnap.com/forums/showthread.php?t=736700
Do bring along whatever camera you have and check out the cameras/lenses/etc yourself.
Pentax history and legacy is here :
http://www.photoxels.com/history_pentax.html
The first Japanese SLR manufacturer with many firsts through its long history.
This was exactly what I found out by looking at the price guide last night. I was pretty set on getting the Pentax thanks to all your recommendations and am intending to get the Kit II set after I actually see a Pentax in person.
However the price of the 50mm f1.4 is soooo expensive compared to the canon 50mm f1.8. To me I think that f1.8 is more than enough for me. On the other hand $899 for 2 lenses seems like a great deal. I do not see the aperture for the kit lenses on the price guide, does anyone know?
I see ourselves visiting the zoo quite often when our baby gets older and can walk, would the 1000D kit lens be able to work? 55mm seems pretty short when you want to take a cool photo of my favourite white tigers.