Savage XL outrunner conversion

Hi there

I got interested about a direct drive conversion for my savage xl.

so i am looking for a suitable outrunner bl motor.
the problem is that you have to pick the right one for your conversion because of the kv rating.

i am running 4s 5000mAh and a 100A hobbkying car esc.

Well, i choose a few different types:
1st: this one *klick* with 580kv

and here the speed calculation:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 1
Pinion Tooth Count: 1
Total Voltage: 16.8
Motor KV: 580
Tire Diameter (inches): 5.91
Tire Ballooning (inches): 0.5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 1 : 1
Total Ratio: 3.30769 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 6.56:1
Total Motor Speed: 9744 RPM
Vehicle Speed: 60.56 mph (97.28 km/h)
Effective KV Value: 580
KT constant: 2.33 oz-in/A

2nd: this one *klick*
with 380kv

here the results:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 1
Pinion Tooth Count: 1
Total Voltage: 16.8
Motor KV: 380
Tire Diameter (inches): 5.91
Tire Ballooning (inches): 0.5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 1 : 1
Total Ratio: 3.30769 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 6.56:1
Total Motor Speed: 6384 RPM
Vehicle Speed: 39.68 mph (63.73 km/h)
Effective KV Value: 380
KT constant: 3.56 oz-in/A

3rd: this one *klick*

results:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 1
Pinion Tooth Count: 1
Total Voltage: 16.8
Motor KV: 400
Tire Diameter (inches): 5.91
Tire Ballooning (inches): 0.5
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 1 : 1
Total Ratio: 3.30769 : 1
Tire Circumference (inches): 21.71 inches (551.39 mm)
Rollout: 6.56:1
Total Motor Speed: 6720 RPM
Vehicle Speed: 41.76 mph (67.09 km/h)
Effective KV Value: 400
KT constant: 3.38 oz-in/A

Tell me what u think is the best joice.

Thanks
Regards, DanteX (Andy)