Alright. So, you didn't state whether or not you will be overclocking, gaming, need an SSD, etc. But anyway, here are the parts I rounded up.
Case - So the case I selected was the Corsair Carbide Series 300R, it's a nice looking case, in my opinion.
CPU - For your CPU I selected the Intel Core i5-3570k, or if you don't need/want to overclock, the Intel Core i5-3570 (though, I would just suggest getting the K version, if you ever decide to overclock as it's only $5 more).
Heatsink - You may want an after-market heatsink, or not. If you do, I suggest the Cooler Master Hyper 212 EVO. It's a fantastic cooler, and it's on the cheaper side (you will want to buy this if you plan on over-clocking).
RAM - RAM comes with the motherboard I selected, but that is a limited offer. This RAM is also faster, and G.Skill so... it's awesome. I selected the G.SKILL Ripjaws X Series 8gb (2 x 4gb) DDR3-1333 CL7
GPU - The MSI Twin-Frozr Radeon HD 7950, is what I have chosen. Don't need that much GPU horsepower? Step down to the EVGA SuperClocked GeForce GTX 660 2GB GDDR5.
Motherboard - MSI makes good boards, and I saw this- the MSI Z77A-GD55. Comes with some nifty features (On-board Power, Reset and Overclock buttons (useless most of the time but still neat)), and has two SATA 6GB/s (which is what you'll need for your SSD (if you plan to get one) and HDD), has plenty of PCI-E slots and supports up to 32GB of RAM, so if you ever need more, just order another set of the same stuff and stick it in.
HDD - Western Digital... some people say they're great, some say they're bad. I chose the Western Digital Caviar Blue 1TB HDD.
SSD - Does he need an SSD? Does he want an SSD? I don't know, so I listed one to be sure. I chose the Samsung 840 Pro Series 128GB SSD. It's fast, reliable and ... awesome.
PSU - The most precious part of the computer. Now, Rosewill doesn't make too bad of PSUs, so I chose the Rosewill CAPSTONE Series 750W 80 Plus Gold PSU for you. While it's not even semi-modular, it delivers 750 watts on a single 12V rail and is 80 Plus Gold, so it's nice and efficient.
Total Price (First items I list, HS + RAM + SSD) - $1,180.7