Gwen/Trent definitely. They deserve each other in the best ways. They get along and they were almost TOO sweet in Season 1.
Courtney/Duncan definitely. They deserve each other in similar ways. Plus, I like to see nice-guy Trent win a girl for once. Duncan is just mean.
Liked the ending, though Alejandro losing both his money and his new-found love was bittersweet. The ending gives me hope that we haven't seen the last of him. I would greatly enjoy another season, with Alejandro and Heather having to deal with her betrayal, if you want to call it that. Of course he'd probably be in the suit, so good luck working any charms on Heather.