In my searches online, it seems the Roadtrek 190 is a lot more common. Not too many Roadtrek 170 models for sale right now, but who knows... in a few months when I'm ready to buy (could be sooner), there could be more 170's out there for sale.
I'm definitely buying used. I think an early to mid 2000's Roadtrek 170 or 190 (or comparable Pleasureway perhaps, but not a widebody) is selling in the high $20,000 range to the mid $30,000 range. It seems the 2002 and older Chevy based models sell for a bit less, like the low 20's.
A 170 would be great, for easier parking and fitting into small parking spaces, but if I end up with a 190, I'll be OK with that too. Interesting the Dodge based 170 handled better than the Chevy based 170. I've only ever driven the extended versions, and as I mentioned, with the extended vans, I thought the Chevy handled a lot better than the Dodge. If I have the opportunity to test drive a Dodge based 170, I'll try it. But I'm kind of liking the newer look and technology in the Chevys, especially the 2003 and newer Chevy chassis.
