850w should be enough for that build! Don't forget, you can always swing by your local Micro Center and speak to one of our knowledgeable Build Your Own associates who can guide you through every part you'll need for your new build! We can also price match most other main retailers that have the product in stock.
Hope this helps!
Submit photos and a description of your PC to our build showcase
See other custom PC builds and get some ideas for what can be done
Services starting at $149.99