Any Opinions on Sako P94s and is $800 a good price on a use gun?

Yes, $800 is a fair price, assuming the gun is in nice condition. I wouldn't hold out hope of finding one much cheaper.

I own one and like the action even better than its predecessor, the M-78 Sako. The trigger is good and there is little about the rifle to criticize.

Accuracy is as good as the ammunition you put through it. The cheap bulk stuff shoots incredibly well and with it you can usually get four out of five shots touching at fifty yards. There is always a fifth shot (regardless of where it is in sequence), however, that will fly a half-inch wide. I haven't tried any of the match ammunition, but I'm sure that if I tried three or four brands that one of them would easily settle into quarter-inch fifty yard groups. On a still day.