Storing variable in perment memory location in LPC2378

Dear sirs
I have one counter variable updating on every 1 second.I have to store that variable in perment memory location.so that I will use that counter after power OFF and ON hardware.but I want value of that variable is last value befour Power OFF the H/W.I want also start counting from last value (not from zero).

Plz suggest me which memory area is sutable to store such variale which is updating at every 1 second.Because it may affect read write cycle life of flash memories.
Here are some memories that I know
1)On chip flash LPC2378
2)On chip RTC battary backup ram of LPC2378
3)External flash
4)External EEPROM.

Thanks&Regards
Parineeta
India

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