I use a Rollei 6008AF. It is superb camera. I bought the kit as a demo from Camera West in Monterey, CA. They are a very good dealer. The 6008AF, 80mm f/2.8 AF and 6x6 back was 3000 USD. Non-AF models will be cheaper. Mike Nejad at Ctrades.com also sells Rollei stuff and is a trustworthy dealer. Eli Kurland at Kurland Photo also sells a lot of Rollei items, but a bit more expensive. He is a fully-authorized dealer though. Of course, KEH and ebay are also good places to look.
Things to look out for include the batteries and charges -- ideally you want charger C, the discharging charger, but that was only introduced last year, so most will not come with it. Depending on the age of the camera, the battery might need replacement (it costs about 125 dollars).
In any case, if you have any specific questions, feel free to contact me. The Rollei 6000 series is truly phenomenal, but it is a bit difficult to obtain information on at times because so few people in the US use it.
Also, I noticed that you are in NJ. Danielle Inc, the distributor for Rollei is located in Fairfield, NJ, so you might call them and talk to them.
http://www.daniellecoffee.com/
They are a coffee importer too, so they will give you a great espresso while you are there!
