Catblaster, As one other poster mentioned CZ is bringing out some of the really big magnums this year in their 550 Magnum. They haven't set the final pricing as yet, but it is rumored to be in the $1800 range. Also, it won't be a stainless gun.
Check their website frequently, and you might be able to find out more about them as time developes. I am sure however, you will not find a rifle in any caliber of that class for that kind of money. As for the weather resistance of stainless, for that sort of savings you could have the metal coated with one of the new coating technologies. I hear good things about the coating that "Fit 4 Duty" is applying.
Good luck with your project, and if you do pull it off, please post it so we can all drool over it.
"Ride like the wind, or a little faster!"