Yes, 80/2,8 Planar is the way to go if you want a lightweight and fast normal lens.
Be aware that the early C-versions had only a simple dual-coating (which is quite good as long as you don´t shoot straight into the sun, IMHO), but are also less expensive.
Later versions which are multicoated bear a red T* sign on the front. Nethertheless, the
early versions are still good and I had superb results even without multicoating.
If you want a more modern lens, Zeiss made a "budget" line of lenses in the 90s where they used more plastic in some parts of the mount, like the filter bayonet. These lenses are called CB. There was also a good wideangle, the CB 60/3,5, but it is difficult to be found used.
Lenses for this Hassblads will need an inbuilt central shutter. The fast lenses for the focal plane Hasselblads like 50/2,8 150/2,8 110/2 won´t fit!
Enjoy your new Hasseblad and feel free to ask if you have more questions!
Greetz, Benjamin