The LP PHD10 should be perfect for the BX1500. I run a full sized PHD on my BX2200. The PHD10 is a nice small unit and would match the BX1500 well.
Land Pride does sell a downpressure kit for that series. It isn't recommended by LP for the Model 10 (only model 15 and higher), however it can be put on. TBN member ultrarunner has the LP PHD10 and downpressure unit on his BX23. You would likely not need the downpressure unit unless you have hardpan. I think LP provides a Pengo auger with this PHD. Pengo augers are available with a variety of very agressive bit tips for differing types of soils, hardpans, and even rock.
I was at the Kubota dealer this week and saw a Gearmore sub-compact PHD Model D20 on a BX2350. Gearmore also provides Pengo augers and tips. It was about the same size as the LP PHD10. It was obvious that the BX2350 could take a bigger unit and that this little Gearmore would be more appropriate for a BX1500.
Gearmore mainly sells in the west, but does sell some things nationally, so don't know how easily available this unit would be in WV.
BTW, regardless of whether you went with LP or Gearmore, you can actually choose an alternate auger and tips from Pengo. Give them a look at:
Pengo