I agree, buy what animal you like and what fits in your plans.
When I got my pastel, it was based entirely on his phenotype and what he looked like.
Later I asked... about 4 months after getting the snake, as to the origin and where the stock had come from. It was a good line, and there was a very clear delineation regarding what generation mine was, etc. But that never impacted my decision, it was based on this snake being, IMHO, a perfect example of what I found appealing in a pastel.
I see lots of people that slap the name on the snake and hope for the best. I quizzed a guy at a show that had done that. His response. `well i made this snake, with my male that i got from so and so... he got his stock from so and so, who claims it was a *insert brand name here*...` to me that is too many cooks hanging over the stew.
bruce