Jools
You certainly don't want an EL series if you are going to be carrying the camera about doing landscape work, which I see is your area of photography. The EL is a studio beast.
The standard 500 series (500C/M, 501, 503 etc) are all good rugged, portable beasts with a great selection of lenses, finders and magazines. You can shoot 120 or 220 film in 6x6 or 645 format. There is a Hasselblad accessory, usually beautifully made, for just about everything. The only thing lacking really is a shift lens.
However, they are idiosyncratic old beasts - you have to remember that the original 'Blad came out in 1946 and the 500 series in 1957, and they never changed much at all - so you have to get to know and love their little ways. This is a camera which you use in a deliberate, contemplative fashion. It is not quick, and it won't be rushed. Good for fast-moving sports or candids it is not. Prices for the 500s and the Zeiss lenses seem very low these days, but don't get too carried away. Spares and service are very expensive, and all this kit is now elderly. I have got used to doing a lot of my own servicing and repairs, but even so there is no way I am going to try to fix a Synchro-Compur shutter. My own collection includes just about every item made by Hasselbald for the 500 during the 1960s, so you can tell that I am biased - but I do use it all for photography. The Hasselblad 500 is undoubtedly one of the most iconic and influential cameras ever made - along with the M3 Leica, the Rollei TLR, and the Nikon F. One of the nice things about using one is the comments it draws when I am out and about - an awful lot of people seem to recognise a 500, and it gets the same sort of attention as a classic car.
John