The male pastel possible super looks to me like a regular old pastel, no super. As far as the hets - you have to trust him on that and because you don't know him. So that leaves the pastel female het for pied. I'd grab her if she is, indeed, het. At 350 grams, I'm guessing she's a mid/late 2010 girl? She'll probably be up to size and breeding in 2012 if she's a good eater.
There are a LOT of snakes available at any given time. Look on kingsnake.com. Buy the animals you like and want to work with not because they're a good deal but because you like them the best. You'll be happier in the long run. Of course, if you trust him, those could be good deals
Just my two cents