When you choose a PSU, give yourself room for your system to grow. When I built my Haswell rig, I chose the AX860i. I don't need all that power, but now I have the option to add additional components if I so choose to do so. I don't think that many people will disagree that the AX and AXi series of Corsair PSU's are the best on the market. The only thing that most people don't like is the price. I got a good deal on my AX860i at $200.00. I don't regret it though. I don't have any worries about my PSU going bad and damaging any of my other components. Another thing that having the extra wattage achieves is that my PSU doesn't have to push very hard. It barely breaks a sweat when running at full load. Coupled with that fact and the 7 year warranty that comes with the AX and AXi, I rest easy. The AXi is also the only digitally controlled PSU on the market, which gives you VERY tight voltage regulation. It also comes complete with a Corsair Link module, giving you the power to monitor and manage basically every aspect of the PSU and it's distribution of power to your other components. No other PSU (to my knowledge anyway) gives you this much control. If you like to have that extra control, the AXi is worth the extra money over the AX series. In addition, only the AXi is digital. While the AX series is still one of the top PSU's available, the AXi is the only one that offers you all of these extra features.
Many people look at the PSU as a good place to cut corners and save a few bucks. I don't agree with this practice. Think about it......your PSU truly is the heart of your system. Basically every component in your build is dependent on it to deliver the exact amount of power that that particular component needs in order to function properly. If you PSU takes a dump on you, your very expensive components are what takes the punishment. So if your budget allows it, place your faith in a quality PSU that is well built, has good support from the manufacturer (and Corsair DEFINITELY does offer good support), and one that doesn't have to strain constantly to divvy up the correct power to your components. The AXi is what I would consider the most capable for all of that, and without question, I stand firm on my statement that it is worth the money that it costs.
Enough about PSU's though. LOL For your motherboard, this is a very capable board within your price range:
http://www.amazon.com/Gigabyte-SATA-6Gbps-Motherboards-GA-970A-DS3P/dp/B00DJ3DWN2/ref=sr_1_3?ie=UTF8&qid=1395851178&sr=8-3&keywords=am3%2B+motherboard
Something to keep in mind with motherboards and their price: A more expensive motherboard DOES NOT deliver better performance. What you get in the more expensive boards is more sockets. So this 80 dollar board is going to give you the same performance as a 300 - 400 dollar board. It just won't give you all the extra sockets for adding more components.
I thought I'd throw that in there just to give you some more knowledge in the field.
I hope this clears up some things for you. If you have any more questions or comments please don't hesitate to ask. I don't mind a bit in helping you to decide what components are right for you. The only thing that matters is that you get what you want/need.
UPDATE: I am enclosing links to the AX860 and AX860i PSU's just so that you can take a look at them. It is perfectly understandable if you don't have the money to get one, but it doesn't hurt to look. I will also post the link to the AX860i from Corsair's site. It will give you far more information than Amazon does.
http://www.amazon.com/Corsair-Professional-860-Watt-Platinum-AX860/dp/B00A0HZMKG/ref=sr_1_1?ie=UTF8&qid=1395852127&sr=8-1&keywords=AX860
http://www.amazon.com/Corsair-Professional-Digital-Platinum-AX860i/dp/B00A0HZNDW/ref=sr_1_2?ie=UTF8&qid=1395852127&sr=8-2&keywords=AX860
http://www.corsair.com/en-us/power-supply-units/ax-series
And in case you're just willing/able to drop the cash to get one of these, I am also enclosing a couple of links to one of Corsair's PSU's that are much better than the CX series. The HX and CS series is also a very capable PSU that isn't as hard on the wallet as the AX/AXi series.
http://www.amazon.com/Corsair-Professional-Certified-compatible-Platforms/dp/B002LVUPZQ/ref=sr_1_7?ie=UTF8&qid=1395852522&sr=8-7&keywords=Corsair+HX
http://www.amazon.com/Corsair-Series-Modular-Efficient-CS650M/dp/B00GH9NA2I/ref=sr_1_2?ie=UTF8&qid=1395852651&sr=8-2&keywords=Corsair+CS
I know this is a lot of info, but I think it will help you out a great deal.
I have an 840 and LOVE it! It gives you speed/performance like you wouldn't believe. It only costs 84.00 to boot. Cheap enough!
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