Well here is some:
Erich Hartmann 825 missions, 352 kills, shot down 14 times.
Missions per Kill: 2.34:1
Kill Ratio: 25:1
Gerhard Barkhorn 1104 missions, 301 kills, shot down 9 times.
Missions per kill: 3.66:1
Kill Ratio: 33:1
Günther Rall 621 missions, 275 kills, shot down 8 times.
Missions per kill: 2.25:1
Kill Ratio: 34:1
Otto "Bruno" Kittel 583 missions, 267 kills, shot down 1 time.
Missions per kill: 2.18:1
Kill Ratio: 267:1
Walter "Nowi" Nowotny 442 missions, 258 kills, shot down 2 times.
Missions per kill: 1.71:1
Kill Ratio: 129:1
Wilhelm "Willi" Batz 445 missions, 234 kills, shot down 4 times.
Missions per kill: 1.9:1
Kill Ratio: 59:1
Hermann Graf 830 missions, 212 kills, shot down 1 time.
Missions per kill: 3.9:1
Kill Ratio: 212:1
Helmut Lipfert 700 missions, 203 Kills.
Missions per kill: 3.44:1
Kill Ratio: 203:1
Alfred Grislawski 800 missions, 133 kills, shot down 4 times.
Missions per kill: 6.01:1
Kill Ratio: 33:1
Adolf "Dolfo" Galland 705 missions, 104 kills, shot down 4 times.
Missions per kill: 6.77:1
Kill Ratio: 26:1
Josef "Pips" Priller 1307 missions, 101 kills.
Missions per kill: 12.94:1
Kill Ratio: 101:1
Werner "Vati" Mölders 330 missions, 101 kills, shot down 1 time.
Missions per kill: 3.26:1
Kill Ratio: 101:1
For more info on many of the German aces check out:
Kacha`s Luftwaffe Page