What combos do you really like? An enchi hypo or enchi 100% hypo female would work well since enchi butters look great on their own and really scream with the hypo gene.

With that said, I would personally save and get a hypo butter for breeding purposes. By doing this, you eliminate the possibility of producing possible hets and in my opinion would be better for furthering your hypo projects if you're really interested in working with this recessive gene.

Before adding a male for breeding, I would consider adding a female or two that has the hypo gene (visually or het) and grow her up since she'll take the longest to get to size.