Well, since you put it on your list I'll assume you have the cash to afford the Sako, which of your choices would be the one I'd pick first. Sako makes a fine rifle, as good or better than most rifles on the market today shy of custom and semi-custom rifles (i.e. Kimber, Cooper, etc... though, while Cooper certainly makes a fine rifle, they couldn't pay ME to own one after what Dan Cooper did).

I also like the Browning A-Bolt, and if the X-Bolt is as nice as the A-Bolt it'd be a good choice too. I've yet to actually handle an X-bolt, so I can't comment on it.

http://www.usatoday.com/news/politics/election2008/2008-10-30-gun-ceo-ousted_N.htm

Mike