If you think of your RV as an investment you will want to buy only molded
fiberglass. For the most part, anyone that has owned one for more than 5 years can usually get everything back and then some when selling. Stick-Builts, especially used stick-builts, are much more prone to hidden damage that can cause substantial depreciation.
I used to live in Springfield, VA and I know that the weather out there can destroy or do hidden damage to a stick-bult in a single season. Think rain + freezing weather + more rain, etc. If ice can split rocks, just think of what it can do inside a Serro Scotty's walls.
BTW: As to price, Oliver's are a special case. There are lots of decent f/g rigs in the under $5000 range. Right now there is a neat little Hunter Compact Jr, in Richmond, VA, listed on eBay. Start small and enjoy learning.