Sy, I also love crested succulents
I think your plant, is similar to my Opuntia cylindrica cristata, these were photos 2011 to 2013, if given wider space it can spread horizontally a bit but still stay in that crested form, just not too tight. It is quite a forgiving plant, since I leave it outdoors all year round, and during our rainy months, it tends to suffer from cold damage but it bounces back later. Our long, dry hot months helps it recover nicely.
Photo this 10Nov2016: a part of its new growth at the back (right) is no longer crested, more of upright column.
