IMac Monitor as PC Monitor

I got my feet wet with a Mac Mini and and now looking to buy an iMac. However, I will probably always be in a dual Mac/PC situation. I've gotten comfortable working with a single monitor, mouse and keyboard using a KVM switch.
So, if I get an iMac with a 20-inch monitor, I think I could use it for both Mac and PC if I get a vga-to-dvi converter. Is that correct? Any gotchas?
  Mac OS X (10.4.5)  

Only because this answers your question more directly. Personally I'm with -Kryten- go with the BootCamp or similar option. 
This isn't suitable for watching video/games but should do for routine computer usage:
ScreenRecycler. (Thanks Niel for finding this!)
mrtotes

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