i need a new computer for myself and hun-hun! we were thinking of getting a refurbished unit from IBM or dell, i've heard of intergrated systems that would mean that all the components i.e., soundcard, videocard and or modem are sodiered to the motherboard. my question is do any of the manufacturers make upgradable systems anymore? and which manufacturers do? i have around $550.00 to spend and would like a system with a 2.4 ghz processor, usb ports, CD burner a network card and modem do these exist or am i just kidding myself? the machine would mainly be used for colleges studies and online courses, although i'm not a gamer i would like to play splinter cell or something like that on it in the future.