Welcome to the forum!! You came to a good site for information of all kinds related to RV's as well as many personal opinions.
First, I've never owned a Class B or C, sticking with a travel trailer or 5th wheel. I've seen and gone through all classes of RV's though. Personally I would think your money will go farther by looking for a smaller Class C. The Class B's I've seen are quite expensive in my mind. Plus you're limited for space. There are a lot more used Class C's out there too and some are only slightly larger than the newer Class B's.
Joining an RV membership like Good Sam isn't a bad idea. For $25/year you'll easily save a lot more than that cost within a few weeks or a month. Of course that depends upon where you plan to camp while traveling. Traveling can be expensive due to fuel costs and camping fees. Local, state, and national parks are certainly less costly, but those fees still add up over time.
Looking into workkamping might help reduce costs and give you another perspective on RV living. There is a forum on this site just for that.
Hope this helps a bit. Good luck!