If the cunning plan is to get him/her to sculpt more - than for the love of the gods - do it!
In my humble opinion, the Xyston range is by far the most consistently high quality and only rivaled by Legio in the 18mm ancients and dark ages.
FiB and Khurasan have some great codes - but they are smaller and not nearly as bold and paintable with the detail, and Museum is on the most part close but just not the depth. The Xyston range - and it really is so consistent - is still of the highest quality.
IMHO of course;)