magiging problema mo lang is the memory, DDR2 yan, mahirap na hanapin ang DDR2 and kung may mahanap ka man sobrang mahal
but other than that, ok lang kahit hard drive, video card, PSU palitan mo, since later kung mag full upgrade ka (CPU, mobo, RAM), pwede mo naman gamitin parin yung video card, hard drive, PSU
kung baga dahan dahan na upgrade mangyayari, except for the RAM. since kukuha ka rin naman ng bagong video card, and hindi naman mabigat yung games na lalaruin mo, tingnan mo muna kung kayanin ng 2GB RAM para hindi ka na bumili ng RAM (besides im assuming the OS of this is only 32bit so pag nag 4GB ram ka, hindi rin magagamit yung buong 4GB)