If you are interested in DBs I may recommend you the getdpi-forums, there are plenty of people who can give you first-hand information on these. Regarding the cameras: I donīt think there are many differences apart the TTL-feature. If you want to use it, get it 503-series, if not a 500 or 501 series will suffice. You can use flash with these too, using a flash with dedicated sensor.
You can't really go wrong either way. Outstanding cameras both.
Hasselblad bodies 501, 503 and those that are badged '500CM Classic' have the Palpas light suppression material, late EL series and 200 series also have Palpas.
I suppose that there is no reason the same material could not be fitted to an earlier model.
As most Hasselblad cameras have interchangeable backs the expression 'analog' Hasselblad only really applies to cameras that do not have interchangeable film backs.
I am very happy to be here. I don't know why I did not find this forum earlier. I am the only active 'one of you' in the UK but I think you have several in th USA. Hasselblad engineers that is!