I would disagree in selling the parents if you are growing your collection and are planning on continuing having projects. You can always use females when your breeding. It depends on how big you want your collection and where you want to make your cash. If you do sell your spider female and get 800 for her. If later on down the road you need a spider female you will have to start from scratch or spend the cash and hope you get a female that is ready to breed or can breed. Some snakes will not breed for you and thats why they are for sale. You have to be careful.
As far as hets go, I would be very very very very careful where you buy them. Make sure you get them from a reputable breed and that doesn't always guarantee they are truely hets. You than run the chance of never producing the gene. I have a pair of het albinos from my breeder, I'm not too worried because I spent $75.00 for the pair because I'm a regular customer with him and $75 is not bad if they don't product for me. Just be careful. :D