Hi Hamsofiane
I really dont think these features will increase the CPU dramatically.. CEF is not mandatory for these features, but have CEF turned ON in Layer 3 devices which helps in other ways..
More than worrying about the resource utilization, you should concentrate on a concrete design and troubleshooting procedures when implementing these technologies on the network.. these can become quite complicated when implementing with technologies like 802.1x , NAC etc.. in any case you shouldnt be having major issues configuring them, since there are tons of documents available on CCO, and ofcourse you have got Netpro users who would help you...
Raj