Chocolate Palomino is just a term for a dark palomino.
Personally, I love Arabians above all other horses. I rode a chestnut Arab stallion for several years in high school and the barn where I ride now has at least six half Arabs. The owner was breeding fancy colored pinto, palomino and buckskin half Arabs that are soooo gorgeous but the horse market is terrible right now so she stopped breeding. Currently I've been riding a quarter horse but she has the personality of an Arab, very personable and always wants to go go go and fast.