I think you will really like Paph. lowii, it really has an unmistakeable look that no other Paph. possesses. It really stands out in a crowd....especially when it is "specimen size"!
Going strictly by appearance alone, which I'm usually inclined to do, I voted for paph lowii. I hope you'll tell us which one you get and keep us updated on how it grows for you.
I'm waiting for my order to come, might take a while since I'm getting it from a collector that is waiting for a better shipment, will keep you guys updated!