Help me spec out a gaming computer for my son

My son, Tristan, turns 12 this week. Not only did he ask for a gaming computer for his birthday, but he wants to build it with me.

I've got some ideas, but I know that plenty of you are much more versed in building out a new computer than I am, so I was hoping you might want to offer some suggestions.

I'm hoping to spend $500 to $750 for the computer and don't need a case, monitor, keyboard or mouse. Any suggestions would be GREATLY appreciated.

Here's what my dad was suggesting (it's a little over):

Motherboard: GIGABYTE GA-Z77X-UD3H LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Price: $139

CPU: Intel Core i7-3770 Ivy Bridge 3.4GHz (3.9GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I73770

Price: $299

RAM: CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B

Price: $699

SSD: SanDisk SDSSDP-128G-G25 2.5" 128GB SATA III Internal Solid State Drive (SSD)

Price: $99

HDD: Seagate Barracuda ST1000DM003 1TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Price: $75

Video card: SAPPHIRE 100358L Radeon HD 7770 GHz Edition 1GB 128-bit GDDR5 PCI Express 3.0 x16 CrossFireX Support Video Card

Price: $99

Case: SilverStone Precision series PS05B-USB3.0 Black Plastic & mesh front panel and steel body ATX Mid Tower Computer Case with Tool-less Installation Design

Price: $56

Power Supply: SILVERSTONE SST-ST85F-G Evolution 850W ATX 12V v2.3 / EPS 12V SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply

Price $199

Total: $1035

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