Ah... Cordy/Doyle... those were sweet days. It's hard to pick a fave moment... Let's see... *thinks*
I think my fave scene is actually after Doyle was already gone - in "Parting Gifts". That was the first episode I ever saw and I loved the way she was talking about him, remembering him. Back then I even thought that they had been a couple.
Or that look on Cordy's face when she saw him on that info screen in "Birthday"...
Or... that scene on the ship in "Hero" when they finally start thinking about a date and everything...
or when they were doin' that AI promo thingy - "our rats are low" gets me every time...
or... okay, I stop here...