That's smart to look carefully before you leap !
Drchronic is a good one from all the posts on here, though I have no personal knowledge, as in having ordered anything.
You can't go wrong with Planetskunk or DrGreenthumb either; well, I'll say that conditionally, as from time to time, things do change, like seed boutique is not around any longer, and HGS is back in business.
But, in the past, I've had great luck with those 2, and doc takes credit cards; Planetskunk doesn't, but has a much larger selection from many seed banks.
Good luck !