Win. 7: Blue box vs green box?

[frldyz]

Im looking @ some sites for Win 7 64 bit professional.
I see some sell a green box, some sell a blue box?
Also some say SP1?

 

[cb600fshornet]

The green box is Windows 7 Home Premium and the blue one is Windows 7 Professional.

SP1 means the software comes with Service Pack 1 preinstalled (don't pay extra for this, it's a free update anyway)