Raimo wrote: A 4.5/80-200 SMC-M Pentax would fit your needs very well - if you can find one. Very sharp and contrasty (mine was sharper than 4/200 SMC-M Pentax that I had before it). Not expensive.
REPLY: You're the second, if not the third, who claims the M 80-200/4.5 is better than the M 200/4. The M zoom represent the first generation of Pentax zooms that really took off saleswise. Almost certainly because it was quite good. The M zooms is not at all a shabby lens optically. Recommended as a budget zoom. Pål