I have a Pentax K110D body and a selection of random lenses:

Sigma 10-20mm, f4-5.6

Sigma 30mm, f1.4

Pentax Manual: 28mm f2.8, 40mm f2.8 and 50mm f1.7.

Pentax Kit lens 18-55mm f3.5

Vivitar Manual, 70-200mm f2.8 (and 2x multiplier to match)

Chinon 500mm Mirror lens

That being said - I seem to leave the 30mm on a lot of the time.