You don't need a UV filter, this is a leftover from film days as the emulsion was overly sensitive to UV wavelengths. DLSR sensors effectively have a UV filter built in. By all means get a clear protection filter if it will protect your lens element from dust, salt spray, splashes of lager down the boozer or whatever any harsh environment might throw at you.
The UV filter is easier for camera store salesmen to flog because it
used to be essential equipment, so the perception is there that it does somenthing, well it doesnt really do any more than a clear glass protection filter.
For physically protecting the lens front element from impacts, a hood is best and it actually improves IQ (another air/glass interface with a filter cannot).
Always, always, always put the lens cap back on if your not using the lens.
Anyway this is just my opinion, the debate on this topic rages on (thankfully elsewhere)
I think the CPL really is the only type of filter you actually do need. It does a lot to cut distracting glare and reflection from water and foliage. It greatly improves contrast when the sun is high in the sky and the light is very "flat". It offers a quite an improvment in environments such as Central Australia and and I guess USA desert states basically anywhere where the sun is high in the sky and haze / reflection is present.
Indoors or in heavy overcast it does little and just reduces available light by about 1 to 2 stops.
I've bought most of my filters and many of my new lenses from B&H or Adorama, never had a problem with them. Everything is shipped promptly and packed well.
They even have a good (7days?) return policy, not that I've ever used it. very confident buying from them even though i'm on the other side of the world.
If you use the links on this site to "get to" the webstore I think Pentaxforums gets some brownie points.
Compare the prices with your local stores with delivery, VAT etc etc. I bought some B&W filters from them as they're only available in 1 or 2 stores here in OZ and are double the price!
Remains to be seen what Ricoh does with Pentax. They have an enormous amount of money and no DSLR line. so I guess Ricoh bought Pentax because they wanted it, not to take it down. All we really know so far in 3weeks is they've kept the Pentax name so at least we know the brandname is valuable to them.
OT: I've just been going through a similar thing in my job. The company I work for which has 170 people in 7 countries was just bought by a German based group with 20,000 employees and turnover of several billion euro. We still all have our jobs, (even got a sign on bonus
). My boss said they obviously bought us because they wanted us, and we have something they didn't in a market they weren't servicing. The sky hasn't fallen in.
Edit: there is a " thankyou " system in the forum. It's the little thumb's up symbol on the left side in the bottom of the post. It adds to the "likes" of the poster.