Which kits are you looking at? I see that Canon in kits with different lenses from $500-$1000..
Also, what do you plan on shooting?.
Canon EOS 350D comes with EF-S 18-55 mm f/3,5-5,6 lens, and Pentax K100D Super comes with DA 18-55 mm f/3,5-5,6 AL SMC lens. I supose they are pretty similar..
I intend to shoot familly photos and my kids (while they play and move)...nature, people and places that I visit. Also I would like to experiment and learn...
Either is good and will serve your stated purposes. The Pentax has built-in Shake Reduction. That means that every Pentax lens manufactured over the past 45-50 years becomes an Image Stabilization lens. Otherwise, your two choices are pretty similar..
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Disclaimer: I have a bias toward Pentax equipment..
As I said, new lenses are not so important for me right now. I intend to shoot with kit lens for some time, find out it's disadvantages and then pick the right lens for me..
Better kit lens, IQ, features and simplicity are characteristics that I find most important right now...
Either of these DSLR's is very well made, and will be a major leap ahead of any point & shoot in the market today. The biggest problem with them is that the supplied kit lenses limit the camera's full potential. I'm not talking about the lens optical quality here, but the ability to gather light (aperture). At F5.6, you still won't be able to take flashless photos indoors. I recommend that you either buy an external flash or a lens with wider aperture. Don't use the built-in flash because it will give you the deer-caught-in-the-headlight look, just like any point & shoot...
Another option is to buy the 350D with kit lens and also the "thrifty 50" 50mm f/1.8. The latter only costs about $70, has great IQ, and will give you the opportunity to learn how to use fast prime lenses. I actually bought my 350D without the kit lens and used the 50mm to learn with. Then, when I was ready, I bought two good (L) lenses. Nevertheless, I still use my 50mm a lot..