Yes, we recommend Ref 9 -> Ref 9 V2.
The cost of going from Ref 9 -> Ref 9 V2 -> Ref 9 V2 SE is the same as Ref 9 -> Ref 9 V2 SE.
For new customers, unless you need more than 200W of power, we would recommend Ref 8.5 V2. Similarly, Ref 8.5 V2 and be upgraded gradually to Ref 9 V2 SE.
Or you can skip one generation and wait for V3 (absolutely no idea when that is available as R&D won't start until this summer).