3 Poss het females are always a good investment if you get them from a reliable breeder......
I would say go for it!!!! Like Randy said it really is an odds game..... Ralph Davis has proved poss hets like crazy and even poss DOUBLE hets which is even harder to do...... His way is to buy all the females from the same clutch....others say its better to pick from from different cluthes.....either way works....
I personally hold all of my females that are poss hets. I have A LOT of poss hets....Albinos, Pieds, Caramels, and even poss het Snow for both Jollif and VPI.....some are 66% others 50% and a whole lot of 25%.......
In the long run they pay off..... the most important thing to remember is to get animals from the right breeder.....I have made the mistake of buying animals from a non reliable founding stock and so far me and another breeder are paying for it big time. Its just the nature of the beast. Oh yeah and just because they are "big" breeders dont think that they are all reliable....
Good Luck
Raul