Lets get the facts...
3 current DSLRs from Pentax (K-x, K-7, 645D (medium format, high end pro, which is why they don't bother with the FF)).
They are extremely price competitive for their features.
The K-x has the best low light performance in its class (Google it).
http://www.1001noisycameras.com/2010...sensor-do.html
K-7 (and K-x) have
in body shake reduction - that means all lenses are stabilised - not just the expensive IS/VR ones.
Even old manual lenses!
Both have live view, movie and the latest gizmos.
Prices...
http://www.staticice.com.au/cgi-bin/...ax%20K-X&pos=5
K-x body only Aussie stock < $700
K-7 body only Aussie stock < $1,200 (not double)
The Pentax K mount means all the last 50 years of lenses still work!
via an adapter for the very old M42 screw mount.
Obviously Sigma and Tamron produce Pentax mount lenses.