I picked Pentax because of fond memories of my first serious (for me) camera. It was an amazing little SLR which used 110 film cartridges. I bought it back in the 70's when I spied it in a camera shop and had to have it immediately. See attached pics.
It came with 3 interchangeable lenses and took remarkably good pictures considering the size of the film.
When I first decided to buy a digital SLR I went for the K100D Super and then moved to a K20D and yesterday I bought a K7 - what can I say, I am a camera junkie and a Pentax lover.
I think the K7 will keep me satisfied for a while now, I love it.