I'd recommend getting one Lesser and pairing it to a Mojave, as that's usually the tried and true combo for good BEL's without eye issues. If they'll only sell them as a pair, you could either look elsewhere, OR get both and look for a pair of Mojave's to go with them.

The eye issues brought up above are that if you breed two Lessers together, the BEL's can have larger eyes than normal, so bug-eyed BEL.

That being said any combination of Lesser, Butter, Mojave, and Russo, even breeding two of the same morph together, can and will produce BEL's. The cleanest of which, I believe, is the Lesser x Mojave pairing. Play around in the genetic wizard on World of Ball Pythons and you'll start to see the slight differences in the BEL's.

Welcome to the addiction! Lol