I bought a Compaq at Best Buy back in the late fall. It's a basic one, and came with Windows7 and I bought Microsoft Office Home and Student 2010. I only got the tower, and it came with a keyboard and mouse, and was $309. I kept my old monitor which is a flat screen, and I am using my old cordless mouse that I just bought last spring.
I've been happy with it, though Word 2010 is a test! Also, have had problems sending Word documents to people who aren't able to read the documents. I guess because they are using a much older version of Windows?
I did have to buy a thingamajig to plug into an port, to read my camera disks, because there aren't any slots on the tower...which I didn't notice until after I got it home, set up, and was already using it. It works for 4 different sizes and was less than $15, and was a whole lot less than what a tower with the slots would have cost.