Oh, definitely Alistair, but Zev is a close second, of course. LOL
I've romanced Morrigan....but it wasn't that much really for me. I like her snarky 'sister' route better, no matter what gender I play as. As for Leli...I've TRIED to romance her, but it just never seems to work out. We never seem to be more than besties. Wine, Women and Song is one of the few achievement I don't have.