As I don't live in the US, I can't buy BB bases (more's the pity but shipping would kill me), but, from my own choice of supplier, I usually buy the SLS free clear base and the goatsmilk milk he offers. I find the SLS free doesn't dry your skin out so much as the one with SLS in it and I love the creamy lather that the goatsmilk base provides (excellent for use on the face which is something I'd never have done before). If this is your first order, I'd suggest to keep things simple and don't go too mad buying everything (though the tempation is SO strong!). In that way, you can experiment and learn how each base works best as you go along.
I'd love to find a shea base but my supplier doesn't make it
So I just add shea butter (or other oils) to the base and it works wonderfully well.