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

[Wadeypatadey]

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

Here's links to everything I'm looking at getting. Please let me know if this is good, bad or somewhere in between. Any help is appreciated. Here's the links:
Case: http://www.amazon.com/dp/B00I6BJ8MQ/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=I2680HN3X77U0B
Processor: http://www.amazon.com/dp/B00KPRWB9G/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=I3BKK0QEC3N6MJ
Graphics Card: http://www.amazon.com/dp/B00NNXVPS2/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=I1KZDWT2J2EM57
Motherboard: http://www.amazon.com/dp/B00KGVBKG6/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=I1LB8JL498GAYB
RAM: http://www.amazon.com/dp/B004CRSM4I/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=I29BW4RAFB9G36
Hard Drive: http://www.amazon.com/dp/B0088PUEPK/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=I25DR7PLRO0D93
SSD: http://www.amazon.com/dp/B00A1ZTZOG/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=2EOQ118YUGAEW&coliid=IPQR21CEM5C1E&psc=1

 

[Pr3di]

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.

 

[Wadeypatadey]

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!

 

[Pr3di]

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.

 

[Wadeypatadey]

Cool, I think I'll go with the 850W and 250 GB SSD if my budget will let me. Thanks again for all of your help! I truly appreciate you taking the time to answer my questions.