I would buy the largest one you can possibly afford. With those two parents, they like to be large and mulit-growth before they bloom. I have one that has been mature for years now, 4 mature growths, no blooms. They are not the easiest, IMHO.
I got mine from Parkside and the cross is one with older parents ('Rex' x 'Deep Pockets')
I finally got my Julius (with 'rex' as a parent) to spike after a cold spot this fall, but I gave the PEOY the same treatment and nuthin!
I had a couple seedlings but sold them when this one proved so difficult.
I'm not trying to discourage you; only saying buy it as big as you possible can get it.