What they are trying to say is probably drop to 2TB hard drive and get a 128GB SSD. Aftermarket CPU cooler is nice to have as well, there are reports of 4770k hitting 90C on stock cooler even when not overclocked.
I've heard nothing positive about the Corsair RM series power supplies. I would personally go with the AX860 --- 4770k, MSI MPower mobo, 16gb Corsair Dominator 2133MHz, Gigabyte Windforce 7970, 120gb 840 EVO, 3TB Seagate Barracuda, Nanoxia Deep Silence 1, Corsair AX860
You should get Windows 8.1. There's no reason to buy Windows 7 when you can get 8.1 for basically the same price. --- MacBook Pro with Retina Display | 15.4" 2880x1800 | Core i7-3615QM @ 2.3GHz | 8GB DDR3 1600MHz | GT 650M 1GB GDDR5 | 256GB SSD | OSX 10.9 | Windows 8.1 Pro