Definitely give CTI a try. We have been to CN and loved the pool and swim up area. The new swim up bar at CTI is a blast. The one out on the island is even more fun. We typically stay at the one on the island until it closes and then move the party to the one on shore for an hour or two at least. When the island is closed (on occasion), we hang at the new swin up bar all day. It is always very social when we are there.
I know everyone on here has there favorite place, and while I can't speak for all four resorts, I know we love CTI and CN. I can't help but think that we will love CSS and CSA when we finally make it to those places. While it is certainly important to weigh your decisions, I just don't think you can make a bad choice with any Couples resort.
Peace, Love, and Respect
CN 2002, COR 2007, CTI 2009, 2010, 2011
CTI June 4-15, 2012