I'd go with the pastel, easier to deal with one clutch than 3... baby spiders aren't worth much, normals are almost becoming giveaways and the pastel girl won't go down in value *much*. Plus you have 3 possible morphs you can hit rather than 1, so its more exciting once the eggs are ready.

That being said you could get slugs, poor odds, no eggs, etc... so don't blow all of your cash thinking you're going to make your money back. You probably won't... especially once you factor in rats, hatchling rack, heating, incubator, etc etc.

Good luck with whatever you decide.