Really either hets or pastels is it for that much..... I dont like working het to het, nothing is 100% het offspring, makes em harder to rehome, also there is only a 25% chance of throwing a visual..... with pastel, you can produce visuals easier, and have a chance at super form..... You dont have to buy a pair now.... spend your 300 on a female and get something a bit nicer, fire's are coming down to about that price range, mojo's, pinstripe, spider, what ever you find that tickles your fancy and that gives you time to find a male as they hit breeding size much younger.
Whatever you do make sure it is something that you think will Kick a