We have been to Couples Negril and to tell the truth we loved CTI MORE! There must have been something that drew you to CTI so just relax and go with it.
You still have some time before your blessed occasion right? The wonderful thing about Couples is they let you change your mind up to 46 days before departure. So if you still feel this way you always have the option to switch resorts. I personally think you are just have some jitters about having to make all of these important decisions about your big day. I know I did!
No matter which Couples you choose ALL will be perfect because you will be there with the one you LOVE ;-)