Ok before they try to sell you any junk follow these guidelines.
Go for an Intel bundle if they have one. If they don't they have the 4670k for sale for 189. That's a steal, get it.
Intel Core i5 4670K 3.4GHz Socket LGA 1150 Boxed Processor 521575 - Micro Center
Make sure you get a Z87 board, it does not need to be anything fancy. Don't spend more than 160 bucks on one.
Don't get suckered into a huge wattage or low quality PSU. You don't need anymore than 650w of a quality unit. So for a guideline, Corsair TX series or better (although the CSM is decent too), or a Seasonic. If you want something they have on sale now, this would work. Although budget, it'll still handle a good GPU.
Corsair CX Series CX600M 600 Watt ATX Modular Power Supply CP-9020060-NA - Micro Center
You don't need anymore than 8GB of 1600MHz RAM. Get the cheapest they have.
As for a case, don't go real elaborate. They should have a Corsair 200r for cheap. It's a good quality case with decent airflow if he likes the simplistic design.
I wouldn't go too elaborate for storage right now. A 1TB Seagate Barracuda or WD Black/Blue would be fine. Just don't get him a green drive.
Now you have enough budget left to get a GTX 770 2GB. Although personally I would purchase this piece from Newegg because MC usually has their prices slightly inflated on GPUs.
Now you should have enough budget left to get your OS and possibly an SSD. If you grab an SSD get the 120GB Samsung EVO. It's usually on sale everywhere.