I have decided to buy the pentax K100d from amazon.com, At the same time I need to buy some filters, particulartly the polarizing filter. What do I need? an adaptor? Which filters? What accessories do I NEED for sure when I get the camera, lens cloth? Bag? Can anyone help me to find the exact items (mostly filters) hopefully on Amazon.com so I can order on Friday (possibly tomorrow if I get lucky with an instant tax refund) Also, when I buy lenses for this, what brands can I buy? Do I look for a particular connector? Can someone explain how that works please? Thanks!