Pentax primes lens are the major consideration for me.
Tiny, high quailty, not pricy.
Combining SR, ISO800 and a good prims len; photo taking at indoor with natural ligting is practical.
"K100D with a 43mm or 40mm prime lens for daily carry in a waistpack, chucking the point-and-shoot digicam in favor of a larger sensor and higher quality optics" (image-resource)
缺點:
If you want to change WB ISO and shooting mode; you need to press button three times at lease.