Professional Dog Clippers

I Am Looking To Buy A Real Pair Of Clippers For Doing My Dogs And To Possibly Get Into Professional Grooming As Well.
Experienced Groomers, What Are The Best Kind Of Clippers And Any Other Tools (scissors, Thinning Shears, Brushes, Etc ) Do You Use And Recommend On A Daily Basis.
I Have Bought Some From Petsmart For Like 60 Bucks And Then After 5-6 Haircuts They Are Junk! Also They Heat Up And Make Lines In The Dog's Coat.
Advice Is Appreciated!