Congratulations! Your time in Negril will be great no matter where you stay. Certainly, each spot offers something different.

I love Catcha for the delicious food; Xtabi for the traditional Jamaican breakfast and cottages on the cliffs (a couple are newly renovated); Samsara for the "hot but cute, " "tiny but fun" huts that overlook the water (I stayed in the yellow one by myself for one month a few years ago); the Mirage for the good rates (and pool but who wants that when you have the sea!).

Yes, I agree that Westender and Blue Moon are very romantic, but they are a bit more pricey and very much off the beating path. My brother and his wife rented the top floor of Blue Cave Castle and loved it for entertaining; but, I doubt that you will be doing much outside entertaining. If you want to enjoy the cliffs and pop in on the beach side every now and then, perhaps you may go for Mirage or Samsara which both have beach options. Wherever you decide to stay, be sure to negotiate your rate.