You will be pleased with any of the DSLR cameras you listed.
I suggest you go to Best Buy and get your hands on the cameras you desire and see how they feel in your hands.
That usually helps with making a decision.
I'm either a very advanced amateur or low-level professional photographer--I don't go looking to sell pictures or do shoots but end up with business anyway. In the last two years my trusty Olympus C-750 Ultra Zoom has become less and less what I need and I'm going to have to get a SLR.
The main thing I'm looking for is something that can take pictures as fast as a film camera with none of that annoying delay when you press the shutter button. Another is, of course, the ability to change lenses since I do a variety of ranges from macro to far distance shots. Megapixel is not as important as speed since I barely print anything past 8 x 10.
Price isn't much of an issue, though I'd rather not spend over $1,000 for the base camera since I figure I'll be buying lenses as well.
Several that I'm looking at are the Pentax K20-D, Sony DSLR-A350K, and Canon Digital Rebel XTi. Any comments on these?
Last but never least, I do have to buy the camera at Best Buy because I want to use my Best Buy credit card which has no interest for 18 months
Thanks in advance!