If you get the SLI one it will come with a 170w Power Brick. You can then order a DVD-RW for the ultrabay for about $80us.
If you get the single GPU it will come with a DVD-RW and a 90w power Brick. Then if you want to add a 2nd GPU, on sale it will cost $137 and off sale $224. You do not have to have the 170W power brick ($90) to run SLI, but it is recommended.
It is cheaper in the long run to get the Y500 SLI and order a DVD-RW.
Always check Lenovo website for some nice sales. and the newer SLI GT750 are out now. They are GT650 with a 22% higher clock.
But you can OC the GT650 with a script(takes a lot to get it to work).
Awesome well that information just provided with stuff I would have overlooked. I am going to buy the SLI edition so that I don't have to worry about the power brick down the road. Kinda just want to buy it all at once and be done. Thank you for the help and fast responses. Much appreciated!