Espy and Umbry, in equal measure more or less. I like Espeon because of its elegant appearance, not to mention quite formidable Sp.Attack power which granted me an edge while I was still playing pok?mon Silver, and Umbreon on the other hand is still a kick-arse defender with its high Defense and Sp.Defense stats. Plus, I like the appearance of that one too. ^^
Other than that, Flareon and Vaporeon are cool too, and Eevee is cute. Jolteon ain't half bad either...Aww heck, I love all of them! But Umbry and Espy are still my favourites. ^^