Hey Rollsman,
You've got a few threads going, which isn't helpful for tracking advice and other bits of information. Based off other posts, you're in Delaware, and have had a number of different questions. To better answer your Cirrus adapter question, there is a major issue you are overlooking. Hasselblad has an adapter for V lenses on H bodies, and there are two things of note - the lever to cock the shutter, and the sync cable that goes to the sync port on the lens. The Cirrus adapter has neither of these. Remember, your H body doesn't have a shutter, it relies on the lens shutter working correctly.
The 80/2.8 is a great lens. It works well, is really light and other than taking a 67mm filter size, it's a easy baseline. It takes the 1.7x H tele adapter really well - consider getting a used one - it is the cheapest way to double your lens collection. The 50-110 is heavy, but I've done some great work with it hand held (outdoors with good light). The 50-110 is also kind of fragile in that it doesn't like sitting on the front element.
You have rental options - you just may not know them as well.
http://www.hasselbladusa.com/about-hasselblad/rental-locator.aspx is a good start.
http://Borrowlenses.com will send to you directly, and they have partner retailers.
Shooting portraits and groups, you want the fluid workflow with a H lens. Landscapes allow you to slow down and consider other options. You can get a mount plate for a few cameras like the Mamiya RZ or the Fuji GX680 and use the back (when powered via firewire). Anything else like a Cambo or a Alpa FPS cost more than adding native lenses.
Hope this helps,
-Joe
