Seeking a crash course before dedicating the hours to mastering.

For someone with the following criteria what counting system do you recommend:
1) Beginner
2) Plan to play 6 deck (DSA, RSA, etc.) occasionally play double deck
3) When proficient, greenie play with appropriate spread and low ROR
4) Hobbyist (maintaining full time job, likely dedicate 100-200 hrs/year on AP)

I was mentally prepared to master Hi Lo but while reading "Burning the Tables" last night I was put on to ReKO (or KO). Any guidance or food for thought would be appreciated.