Ahem....Not quite so bkrownd, Pentax have some excelent choices for lenses, though most are out of production so only available secondhand, and there are the new sonic motor ones due out anytime.
The attached was taken with a Pentax 80-320AF which cost me £149 brand new about five years ago. The lens isn't perfect around the edges but most people who use this sort of lens crop later anyway. you can pick this lens up for around £80 on ebay.
And for the Technophiles.....Pentax K10D, 1/125th f8, ISO 400, Handheld at 320mm, equiv. to around 450mm on the DSLR. Cropped to about 1/3rd original with a bit of "photoshop tree pruning"