Play back and forth like cable slack is ok and sometimes good
As far as levers I originally bought the cheap 2 way adjustable ebay levers and was really pleased with them for over a year. I think the place was
http://shop.the2wheels.com/CNC-Exten...t-Kawasaki.htm
If you want to spend and bit more then get Pazzo's or CRG levers. I like a shorty brake and a standard(long) clutch. With shorty clutch i can only get two or three finger on it so when I pull it all the way to bar it always pinches my pinky, but then maybe I'm a retard.