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Safe cpu setting

122-128Mhz to operate
245 Mhz for Wifi-3G
320Mhz for everything smooth

Screen off profiles are good only if you are a performance buff which means you have say 600Mhz performance all the time and 320 Mhz just to save some juice .
At 98/122 mhz your phone will take a severe performance hit .Lockscreen will hang and the power on button will not be as responsive as with 245/320 Mhz .So more time will be spent to switch on the phone .Not worth it .

Check my views on profiling here in this similar thread
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