Here are the four which sprang immediately to mind, in no particular order.

Having written this list, it occurs to me that all of these are couples who managed to ultimately make things work despite crazy drama on all sides. What can I say, I believe in love against the odds, I'm a hopeless romantic.

Babylon 5, Delenn and Sheridan. I will love this pairing 5ever (see what I did there? Clever, ain't I?). They're very different from each other in quite a lot of ways, but they make it work and manage to stay together despite everything.

Farscape, Aeryn and Crichton. Yes, their relationship was crazy complicated (there was that whole business with the two Crichtons for one thing) and took a long time to get off the ground properly, but their lives were freakin' insane, so kudos to them.

Miss Fisher's Murder Mysteries, Phrynee and Jack. They're such a perfect fit. They took a long time beating around the bush, but got there in the end.

Princess Bride, Westley and Buttercup. Princess Bride is a timeless classic, and their kiss at the end makes me feel all gooey, every time.