What you should have at least depends on how much you're willing to spend, and what you want to use it for.
For basics, I'll just post the price range and what components should be for those two cheap to medium price computers
Hard Drive- 250-500GB
Speed- Processors don't matter to a huge extent, but I say at least a Core 2 Duo intel processor, or a Athlon X2 AMD processor. Speed is relatively the same, or little difference.
Video Card/Graphics Card- Preferably not integrated. At this price range, its harder to get though.
DVD-CD- Nearly every single computer comes with one of these drives. It should have one.
RAM- 4GB or more
Hard Drive- 500-750Gb
Speed- You could snag a deal with a Core 2 Quad or a Phenom x3 or x4, I bet.
Video Card/Graphics Card- A dedicated card is a good priority, but it probably won't be an high end card.
I suggest checking out http://www.newegg.com/Product/Product.aspx...N82E16883103210
one of those would do nicely for you, I believe.
Edited by Vaerli, 09 September 2009 - 02:55 PM.