Hi Wayne,
Nice to check (confirm) what you said from the table on B&C website.
10HPL64: Is medium on Horn Loading and bad on Midrange Usage.
10MD26: Is good on Midrange Usage and good on Horn Loading.
Plus Neodymium magnet speakers usually are more expensive. On this case neodymium 10HPL64 is USD$119(http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=294-678) and 10MD26 is USD$149(http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=294-658&CFID=308704&CFTOKEN=21581430).
Regards.

• B&C Speakers Comparison Table (pdf)