I couldn't agree more with HinFrance's post. In fact, I would go farther and say that the K5
might be a serious competitor to the EOS 7D rather than just the D7000 (gulp).
I think that in many peoples' views Pentax made a big mistake when they seriously hiked the prices of their lens range a couple of years or so ago. Instead they should have concentrated on widening the range to become a viable alternative to Canikon. However, they do offer some superb prime lenses made to very high standards not often seen today and, as HinFrance says, there are plenty of Sigma and other alternatives available to keep cost down not to mention a history of excellent lenses available used at affordable prices - all able to take advantage of the K5's integral shake reduction.
p.s. Jessops - do any serious photo enthusiasts actually go there??? Who cares whether they stock Pentax. They also don't stock Leica