I just bought one with Vista Basic, upgraded to DVD/RW and 160GB harddrive. There was FREE shipping and $11.33 tax ($233.33 total).
If they use the same motherboard for all units no matter the config (I am guessing) there are four DDR2 RAM slots
Thanks SO MUCH for this, cheaper than fixing my parents computer
Remember to select the $10 DVI adapter if you need one