Personally my neofinetia "wish" list changes dramatically month to month. (not so much now that I have too many). There is way too much variation to come up with any sort of "consensus" must-haves. Like if you want the classic fukurin, get a Fukiden. Or use that money and get a dozen other nice varieties instead.
Most are easy enough to grow, I find only a small subset of the typical varieties are difficult.