I'm afraid I'm going to have to be blunt as well....
If you can't afford an extra $50 to $100 on a ~$200 snake, then can you afford vet bills if something suddenly came up with your current snakes? I say stick with what you have for now, until you have both a buffer vet fund and the money for new snakes (and snake food).
That being said, if you absolutely can't decide on which one you like best, then I'd say maybe you haven't found the right one yet.Just my opinion, though....