I'm not sure which way to go here so I'd love to hear thoughts from you guys on this...

I recently picked up a Nikon D90 and I'd like to add a second body to the mix.

Option 1:
I have an opportunity to purchase a well cared for used D200 with around 50K clicks for $500, perhaps a little less. I have three lenses I can use with that camera. Should have some decent life left in it before requiring a new shutter.

Option 2:
Buy a brand new Pentax K-2000 (Km) for a little bit more money and have a host of Pentax lenses available.

Or...Option 3:
and this isn't likely to happen but you never know...
save my pennies for a while and buy a D700 and use the D90 for my second body.

I like Option 3 but 1 or 2 are far more realistic for me.

I also have an older Fuji S2 Pro which I like but am after something a little newer than that.

So guys? What do you think?