KO and upgrading

Beginning counter using KO...thinking about upgrading to a balanced system...can anyone comment on their experience converting from one system to another...for example; do you drop the old system all together and just not play until you're comfortable with the new one? Does anyone keep two systems in their arsenal and play the one best suited for the conditions they encounter? Actively playing two systems and doing it well - is that even possible? Any advice and also any general comments regarding your experience with unbalanced systems is appreciated.
Thank You