I agree, be careful on these right now man. Just came out so it's hard to gauge what's real and what's not with sellers looking to set a precedence.
I think it all comes down to what kind of future pedigree you think Prizm will have. Now with Topps Chrome and Finest out of the picture, perhaps Prizm will become the new thing for years to come. But I'd also have a tough time dishing that much on a non auto card of a brand new product line solely just because of its limited numbering.
certified greens was a good example...the only reason I think Retro pmg's have retained a good value is because they're still based off the original pmg pedigree.