I personnaly don't like Dell.  I'm an ASUS and Intel type of guy.   If you can find a good tech shop, ask then to load Win 7.  Any good tech have both license in stock.  
8 GB of memory is good,  16 Gb is better
CPU @ 3.xx Ghz 
If you are not doing heavy 3D gaming,   You can find awesome inboard MB with video card.