How many watts do I need for my Gaming/Streaming PC and should I buy more than I need?

Solution
Regarding the SSD, if you can get a 250GB that would be great, since I havea 120GB one and already I wish it was bigger.
The RM PSU`s from Corsair are decent. A 750W should allow you to add another card later on if wanted, but just to be sure I would go with a 850W just to have headroom for overclocking the CPU and GPUs.
You need the least a PSU of 550W or more from a good brand.
Look for Seasonic, Antec, XFX, Corsair (not CX/CS/Builder), andtec, Silverstone PSU`s.

Your build looks nice, just the SSD could be better.
Check out for a Samsung 840 EVO or Crucial MX100.
 
Awesome, thank you! What corsair power supply would you recommend? There are so many different types and the prices are quite different. I've heard the RM750 or RM850 is good to go for if I want to add more to my PC in the future.

Also, I'll go with the Samsung 840 EVO, just not sure what size I need. What would you recommend between a 120GB or 250GB?

Thanks for your help! I really appreciate it!
 
Regarding the SSD, if you can get a 250GB that would be great, since I havea 120GB one and already I wish it was bigger.
The RM PSU`s from Corsair are decent. A 750W should allow you to add another card later on if wanted, but just to be sure I would go with a 850W just to have headroom for overclocking the CPU and GPUs.
 
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