Lightbox Wednesday #45: Should I get a zoom?

I've only shot one lens longer in focal length than 85mm in my photographic life; the Pentax-A 135/2.8. It was a lens I picked up on a lark this Spring and took it to a local college graduation ceremony.

 Pentax-A 135mm  f/2.8 on Pentax LX body

Pentax-A 135mm  f/2.8 on Pentax LX body

 Pentax-A 135mm f/2.8 on Pentax LX body

Pentax-A 135mm f/2.8 on Pentax LX body

Telephoto lenses really make you see the world differently and I've been thinking that maybe I should shoot this 135 more. I've also been considering a zoom lens. I've never owned one and really never had the desire to until now.

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I have so many different camera bodies, so the choices are vast. Manual focus or auto focus? Nikon? Pentax? Canon? Olympus? Minolta?

Right now, I am leaning towards finding an inexpensive Nikkor AF-D zoom and shoot it on my Nikon F4 body. Not sure. Suggestions are welcomed.