I shoot Raw+Jpeg....SD cards are cheap and many times the Jpegs are plenty good...sometimes better than my abilities at processing the Raw file. Doesn't cost anything, and you will often be surprised at how well the K5 can process a Jpeg.
I am about to ship my old K5 to a new PF owner...or to his daughter. It has been a wonderful and fulfilling camera, my new K5IIs is only marginally better and then, only in a few minor areas. You should experience much pleasure from your K5 for a long time to come! It is a wonderful camera!
My last two shots with the K5 to check it out before shipping.....
Regards & Happy shooting!