Among the 109s, if it's agility you want then the F4 is the way to go - The E4 is a pretty amazing bird too, but short on ammo unless you are on a'41 server with the softer early planes. On unlimited servers the g6as definitely rules as a dogfighter - great speed, turn and guns - it's my choice when I get frustrated and want to just rack up kills for a couple rounds.

Plane of choice is the 190a5 for me.