First thing that I would choose to make my computer would be the case for all the hardware that I need to put together.

Rosewill BLACKHAWK Gaming ATX Mid Tower Computer Case, come with Five Fans, window side panel, top HDD dock
The reason that I would choose this case is because it looks cool, it comes with five fans for all the gaming that I would do, and it is suitable for the motherboard that I want, too. Plus, it is not that expensive compared to other cases.

ASUS Maximus IV Gene-Z/GEN3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard
This would be the motherboard that I would want, because the chipset is set up the way i would want my personal computer to be like and it looks cool. Also it comes with its own CPU and with 32GB of memory, and it is suitable for the online gaming that I do in my spare time when I’m not with friends.

Rosewill LIGHTNING Series LIGHTNING-1000 1000W Continuous @50°C,80 PLUS GOLD Certified,Pipe-rock Modular Design,Single +12V Rail,ATX12V v2.3/EPS12V v2.92,SLI Ready,CrossFire Ready,Active- PFC ,Fan LED color switch Power Supply
This is the power supply that I would use. First off it just looks cool, and second it supplies enough power for the whole computer.

Logitech MK550 Black USB RF Wireless Ergonomic Wave Combo
The keyboard would be comfortable, and comes with a pretty cool looking mouse. Plus, the keyboard and the mouse are wireless so I can move freely, and lean back and relax while on the computer.

ASUS VS248H-P Black 24″ 2ms HDMI LED Backlight Widescreen LCD Monitor 250 cd/m2 ASCR 50,000,000:1
The monitor will have a crystal clear picture so that i can see everything, so when I get old I can still see everything without having to put on reading glasses.

Western Digital Caviar Black WD1502FAEX 1.5TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5″ Internal Hard Drive -Bare Drive
This is the hard drive for the computer is because it is a fast hard drive and it has a lot of memory for caching.

Logitech Z906 500W 5.1 Speakers
The speakers will be for all the music that I play and I need the surround sound.