Couple Questions about i7 or i5, and wireless connectivity

[my neighbor]

ARe the PCI ones better/faster than USB? Do the USB wireless adapters that you plug into desktop pc's last a long time and are fast with the internet connection from a router at home? Could anyone link me to a good wireless adapter (usb preferably) for a desktop pc?

Does an i7 benefit a alot for streaming video games, does an i5 have that same benefit or is the i7 a lot better for streaming than an i5?
http://pcpartpicker.com/p/jswtsY - considering the i7 4790k or a i5 4690k to save some money, whats more worth it? Does both perform the same with online games like league, guild wars, runescape, and world of warcraft?

Does the Asus Z97-A come with wifi built in or no?

Which one of these RAMs are better with this setup?
http://pcpartpicker.com/part/crucial-memory-bls2kit4g3d1609ds1s00
http://pcpartpicker.com/part/gskill-memory-f312800cl9d8gbsr

 

[digitaldoc]

PCI wifi is no better than USB. Look for one that is 802.11AC for the latest standard.

The USB wifi generally last a couple of years, but by then some new standard has emerged anyway, so mandatory upgrade.

The i7 does not have a great benefit in streaming video games. An i5 is less expensive and should be fine.

Asus does not have builtin wifi.

 

[my neighbor]

Is an i7 going to be the new thing for games in a year or so u think as they may use more cores? People say newer games are starting to use more than 4 cores now a days. If i plan on playing online games such as league, guild wars, runescape, and world of warcraft and some other games, would i be perfectly fine with an i5 or get the i7? I tend to have Google chrome for web browsing, ts, and itunes/pandora in the background when gaming, sometimes streaming at the same time. Would the i5 and i7 perform the same way doing all this? Is the i7 worth the extra 100$ is what i'm trying to get at.

Also i never built a computer this would be my first time, is the assembly pretty easy, along with the installing OS on ssd and other stuff on the HDD?

802.11AC USB Adapter like these? Are these things as fast or faster than the wireless in laptops?
http://www.bestbuy.com/site/linksys-wireless-ac-usb-3-0-adapter-black/9404119.p?id=1219015280006&skuId=9404119
http://www.amazon.com/NETGEAR-WiFi-USB-2-0-Adapter/dp/B008HO9D7M

 

[digitaldoc]

The i5 will be fine for all games, and the types of software you describe.

The i7 will benefit those that do video editing, or CAD.

WiFi AC adapters are the way to go. They will be faster than N in most situations, if your router is AC as well. Most of us are limited by the speed of our ISP so it may not matter much to you.

 

[my neighbor]

alright thanks man.

I'll probably just pick me up one of the USB adapters.