Questions on PC build

[hawkfira]

I am building a computer using ibuypower, and I just have a few questions to get everything optimal and smoothed out before I order.

-Should I go with a 650W or 750W PSU from Corsair? I plan on using an Intel i5 4670k and HD 7950, and I would rather be on the safe side. I've heard that you don't want to get too close to 90% load, so I guess that is my biggest concern.

-Do I need the Intel Pro 10/100/1000 Network Card or will the onboard LAN work well enough?

-Is a liquid cooler unnecessary if you aren't overclocking? Would the Certified CPU Fan and Heatsink provided be enough to not worry about overheating, even if my game's recommended specs are Intel i5 and HD 7950 or higher? I don't want my pc to run hot.

 

[realchaos]

1. 650w is enough unless you plan to crossfire, which I don't recommend since 2-way crossfire scales very badly.
2. If you're talking about the wired network card, you don't need it.
3. The certified cpu fan and heatsink is certified to run the i5-4670k at stock speeds without it overheating (hence the "Certified").