Does anyone have input on the difference between the different makes of YBRs?

I know G is for dual-sport, but what is K? Besides different brakes and being a bit bigger the KG also seems almost the same as the G?
Could someone clear this up for me perhaps? Which would yall suggest?

website for the specs:
K
http://www.yamaha-motor.com.cn/mc/pr...andard_25.html
KG
http://www.yamaha-motor.com.cn/mc/pr...andard_10.html
G
http://www.yamaha-motor.com.cn/mc/pr...andard_11.html
original
http://www.yamaha-motor.com.cn/mc/pr...andard_20.html

thanks!