If it needs to be cheap, the GT-Power/Turnigy/Imax 6 and 8 cell charger and balancers are great. Keep in mind though that while they can charge 8S, thet cannot charge them on the 7-8A that the specs give as maximum. The wattage of the chargers just can't cope with those high demands.

The more high-priced chargers 450-600W can do that with ease, but that is a totally different price-bracket.

For my feathers on 4S LiFe and 3S lipo I use the Imax B6 charger, and the T2M Swallow AC/DC2-EQ. Apart from that I have the Schulze Chameleon that can charge 12 cells on 8A.