I have had a Arab mare cross with a Paly Stallion and I got a Chestnut with flaxen mane and tail. The mares background is the same as yours. So I can almost garentee that you will get a Chestnut!!! Defintally not Bay, dapple grey or black!!
Cremello is a possiblity also is a paly- But Chestnut is your best bet!!
And who ever said Buckskin- well