Hello! I'm building my first gaming computer and have all parts decided except for my PSU. I don't know what wattage would be good but I will list my parts. I would also like to have advice on parts that I may have to change. I'm fairly new to computers so I apologize in advance for my lack of knowledge of something you may ask me.
CPU: Intel i7 4770k
Motherboard: Asus Sabertooth Z87
RAM: Kingston HyperX 16GB
Storage: Samsung 840 Series 120GB SSD, Seagate Barracuda 2TB
GPU: Sapphire Radeon HD 7970
Case: NZXT Phantom 410
Optical Drive: Lite-on iHAS124-04
The 7970 is practically just as good as the 770, in fact possibly better once overclocking is taken into account. And it costs less.
The Corsair HX850 and 500R are high-end and you could get quite decent components for much less money. The Phantom 410 has received good reviews, including a "Best of Tom's Hardware" seal of approval in a 15-way comparison.