Right now, I think used Sinars in the format of your choice are the most camera for the money.
1--An F or F1 was a top of the line portable monorail when it came out. For $250-375 today, it's a steal.
1.5--Well, price/successful print--that depends more on the operator than the camera, but if you're shooting LF and you have a Sinar, you can't really blame the camera.
2--Upgrading price--there's such a glut out there that if you even need to upgrade (say you want another bellows, longer rail, another standard, format conversion kit) from a basic setup, it's pretty cheap, and since all the stuff is pretty interchangeable, if you want more options, just buy another camera and mix and match parts. To upgrade to a new F2 would be more costly, but arguably unnecessary. An upgrade to a P studio camera is also pretty cheap.
2.5--Depreciation--I don't see these cameras getting cheaper than they are now.