I had an '85 Westy with the original engine, and drove it to all 49 states on the continent, and a lot of Canada, over 2 summers. It had 50K miles when I bought it, and 120K when I sold it. It never had any technical problems at all; the only work it ever required was a CV joint replacement in Florida. I didn't mind the slow ride. I found it relaxing, which is what a camping/road trip should be. A fast Westy is a scary thought.
I'm currently looking to buy another one, also. The '86 to '91 years are supposed to be the most trouble free, and that's what I'm looking for. My budget is $10K, which should get me something decent. I have seen some for sale with Subaru engines. Sounds like a good idea.
Anyway, check these guys out:
http://www.poptopheaven.com/
The Eurovans are a lot more money, and less roomy.