Is the PSU in this build good enough?

Solution
Not really. Use the Tier list as your guide. The CX is Tier 3 - okay but no good for overclocking, and you seem to have bought overclocking parts. To be honest, the Rosewill Hive is listed in that tier as well.

I'll echo what's said above re people cheaping out on the PSU simply because it's not immediately obvious what difference it can make. Building a $1300 PC with an i7, 32 GB RAM and three drives and skimping on the PSU is like speccing a top-of-the-range sports car and fitting no-name budget tyres.

Looking through Newegg, I think you'll struggle to get a decent unit at the wattage you need without pushing into the $75-$100 bracket. This one for instance: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182263

We...
For just $10 more, the one you selected isn't a good quality one and it's refurbished.
This is a much better PSU quality wise and it's modular. Don't skimp on the power supply, it's a crucial part of the system.
Power Supply: Rosewill Hive 550W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ Newegg)
Total: $59.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-03 01:34 EST-0500
 
one thing some PC builders overlook is the quality of the power supply. More specifically when Building a PC for gaming and there is a K series SKU. or an Unlocked AMD processor, i have noticed ,some not all, People will get the Cheapest PSU that they can use. I would hold off on getting a Refurbished PSU unless you know where it was used and how. Usually newegg will say that it was used just to test parts. For the amount of $$ that your putting in your other components You may want to get well regarded , good quality PSU that meets your PCs needs and Beyond. The type of PSU you get can adversely effect your components.
 
Is this one better? http://www.newegg.com/Product/Product.aspx?Item=N82E16817139048&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
 
Not really. Use the Tier list as your guide. The CX is Tier 3 - okay but no good for overclocking, and you seem to have bought overclocking parts. To be honest, the Rosewill Hive is listed in that tier as well.

I'll echo what's said above re people cheaping out on the PSU simply because it's not immediately obvious what difference it can make. Building a $1300 PC with an i7, 32 GB RAM and three drives and skimping on the PSU is like speccing a top-of-the-range sports car and fitting no-name budget tyres.

Looking through Newegg, I think you'll struggle to get a decent unit at the wattage you need without pushing into the $75-$100 bracket. This one for instance: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182263

We don't have Rosewill over here, but it's Tier 2A, 650W, full modular, high spec and has had a good review . Down from $140 to $80. I'd have loved something like that for £50.
 
Solution
The HIVE has been updated since that tier was made, it has a much better build quality and a better lifespan.
The only thing that bad about it, is the short PCIe cable. For the rest it's solid. I personally have 2 builds with that PSU, still running for a almost a year.
At the $50 price point HIVE is your best choice. If you're willing to pay more for the power supply, you'll get a better product off course.

The next best PSU for you will be this one:http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013
or this: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151096
But you'll have to break the $50 budget.