Piece, a few points you may want to consider,
1. A few years ago Hasselblad announced they were no longer supporting the earlier "C" lenses and would not ship spare parts. In particular this meant the spring for the in-lens shutter would no longer be available. Some people have concluded that C lenses are therefore no longer worth the risk, yet here in the UK I know several experienced Hasselblad repair technicians who either have abundant stocks of C lens spares, or are prepared to adapt available springs to fit. Either way the message I get is that my C lenses, some of which I've owned for thirty years and which I still use alongside my modern lenses, will still be going strong when I'm in the great darkroom in the sky!
2. Several of the C lenses are particularly good value because the optical design is still virtually unchanged today, the 150mm and 250mm are good examples. They offer excellent performance, are in plentiful supply on Ebay, and even lightly used examples are at bargain prices. The 50mm, 60mm, and 80mm have had more optical changes over the years, but are still strong performers and good C versions are again plentiful and cheap.
3. The earliest Hasselblad lenses had single coated lenses, the later ones have T* multi-coating. It's more of an issue on the wider lenses, but you can find 50mm and 80mm C lenses, even with the earliest (and prettiest) silver bodies, that have T* coating. In any case find and use a lens hood, lens flare along with camera shake are the main barriers to Hasselblad quality.
4. As has already been pointed out, the main advantage of the more modern 50mm lenses is close range performance, and "close" really means when the point of focus is less than about 12 feet. If your main application is landscape at infinity then an older C 50mm stopped down to f8 or f11 is still a very effective tool.
5. The more modern Hasselblad bodies have only a few advantages over the very earliest C bodies. Most notable IMO is that recent bodies now come with a much brighter and crisper focusing screen, the Acute-Matte (or Acu-Matte in the UK). The good news is that this is an easy user upgrade, so if you get bitten by the Hasselblad bug you should keep your eyes open for one of these screens. Secondly, the recent bodies have a "gliding mirror" system which prevents the slight image cut-off visible in the viewing screen (it doesn't affect the negative), this is only an issue IMO with 250mm or longer lenses.
6. I'll risk the wrath of other users by agreeing with your view to avoid the earlier 40mm lenses. There's two absolutely stunning Hasselblad ultra-wide lenses, the 38mm and the 40mm IF, but they're extremely expensive. I use both of these and I used to have an earlier 40mm. IMO this is the one focal length in the Hasselblad range where there's no bargains, unfortunately at 38/40mm you get what you pay for.
7. Another contentious issue is the hand holdability of Hasselblads. Some people seem to make a decent job of it, but for every one who does I know several others who regard the Hasselblad as mainly an instrument for tripod or high speed studio strobe use. Get the manual previously recommended and learn to use the mirror pre-release, the reason Hasselblad made the mirror lock-up so simple to use is because it's important.
Enjoy your Hasselblad, you're using a camera that has produced some of the finest photographs ever taken.