I seriously considered a Rialta in 2006/early 2007. The only ones I figured were any good were the last 3 years 2003-2005 because the VW engine power was increased again. The earliest models were severely under-powered, mid-years also questionable, the last 3 years were still low but acceptable for me.
I personally liked the 22FD Standard floor plan here.

I am so glad we decided to drop the "Rialta" idea and special order a true motor home with real usable practical features,
Our PC2350. It's 2.5 feet longer yet still fit in our garage, a critical requirement. Back then in spring 2007, ordering our new PC was only $12,000 more than buying a used 2005 Rialta. Used 2003-2005 Rialtas were so expensive in 2006/2007. I think because Winnebago stopped production after 2005, people felt they were worth more than they paid for them.