Before you buy a Hasselbled, buy a cheap medium-format TLR like ones from Mamiya or Yashica. You can then get an idea of the benefits of medium-foram without spending too much. You can also find out if waist level finders are for you. I have always found prisms on a Hasselblad awkward and heavy.
You may want to think about a eye level camera like the Pentax 67, Pentax 645, or Contax 645. I think Mamiya made an eye level camera as well.
Hasselbled made/makes nice lenses, but so do a lot of other companies.