keepbusy 0 Light Poster

To maximize gains, I want to use 6 ad networks in conjunction through a "daisy-chain," but I'm worried this will cause performance issues. Is there a better approach? Does a long daisy-chain cause performance issues?

The order I am looking at:
Intergi -> Adify -> ValueClick -> CPX -> Tribal Fusion -> WidgetBucks

This will be used for 728x90, 300x250, and 160x600.

If anyone has recommendations, I'd really appreciate it!

Thanks!