Safari's are great as a mini van!
I consider them and their sister van Astro the only true mini-vans. All the others come under the 'over-sized station wagon wannabe's' IMHO but then I'm not considered to be the judge and jury
As to price - that will depend on a whole lot more info than given - run it through Kelly Blue Book with all the details input and see what it says.
They do come without already being converted so if you're just going to gut the interior then keep looking...you're paying for all those finished details that mean nothing to you.
For full-timing, I really don't recommend a mini-van although some people are quite comfortable living in that amount of space especially if it's just you. Add in a pet and it gets really cramped. I lived OUT Of one for a year but it was always in comfortable weather and I had a 10x10' pop-up style shelter that I essentially attached to the side of the van giving me more living space outside than I had inside. I also towed a cargo trailer so I had storage room for all the necessities. Basically, it became my bedroom and nothing else.