I was married at the Riu Ocho Rios - LOVED IT - and we honeymooned at Sandals Whitehouse. The two resorts were vastly different in atmosphere, however, the Sandals Whitehouse was a lovely spot for a honeymoon. It is secluded, romantic, couples only, with excellent service. Long white sand beach. GREAT food, great selection of restaurants.
My only complaints about it were that it WAS secluded, an hour's drive from Negril on TERRIBLE roads. So there's not much to do off-resort. Also, we didnt receive an upgraded room and found the small room to be a big let-down after our suite at the ROR. But it was really nice and it all depends on what kind of atmosphere you're looking for...