hddpata

Would like to know what could be the cheapest CPU (AMD Sempron) + mobo+ RAM (max 2GB)combination. I wish to upgrade my standby PC, (based on Athlon XP & more than 6 yrs old) to this one. all other components like cabinate, SMPS, HDD(PATA) etc to be reused. This pc won't be used more than avg 1...