Would it be possible to build a gaming PC under $600 - $700 that could be better than the PCs linked below?

http://www.costco.com/Dell-XPS-8500-Desktop%2c-Intel%ae-Core%3f-i7-3770-3.4GHz.product.100010262.html

http://www.costco.com/CyberPower-Cooler-Master-Elite-431-Intel-Core-i7-3770K-3.9GHz-Blu-Ray-Combo-Drive.product.100012851.html

http://www.costco.com/ZT-Desktop%2c-Intel%ae-Core%3f-i7-3770-3.40GHz%2c-Blu-ray-Writer%2c-4GB-NVIDIA-GT630-Graphics.product.100011085.html


Yeah I finally have enough money to build a gaming rig and I want to set a budget of under $600 to $700. The thing is that my Dad wants me to buy a PC instead because he thinks it will be more "secure" in terms of reliability and warranty.

So for under $600 to $700 would I be able to build a gaming rig better than the PCs I linked? Because those are the PCs my Dad wants me to choose.

Yeah I'm planning on building a gaming rig with my friend that can play every game on max settings without any trouble which can also be easily upgradeable to keep up with the times.