If you can find a decent used .444 or .450 Timber Carbine for $500 bucks, you better grab it! Most I've seen are in the mid $600's used and some .450's are go'n for $1200-$1400 NIBs. Heck the .444's on GB were go'n for $800-$1000 NIB! The .375's, if there is a NIB around will push at least $1000 and they are go'n for $500 to $750 used.
As much as they sound inflated, it realy is not. A new XLR Marlin will run ya 'round $700 bucks, and I 'd personally rather have a Timber Carbine or a '94 Black Shadow in a .444. Not that the XLR isn't nice, but the '94's handle much better for me.