I think she means compiling a list of hardware off ibuypower.com that would suite her son's gaming needs.
Here's the best I could come up with from that website, quite overpriced when you compare it to building your own computer.
Gamer Paladin D670
Case ( Nzxt Apollo Gaming Tower Case - Black )
Processor ( [=== Quad Core ===] Intel Core 2 Quad Processor Q9400 (4x 2.66GHz/6MB L2 Cache/1333FSB) )
Motherboard ( [SLI] Asus P5N-D -- Nvidia nForce 750i SLI Chipset w/7.1 Sound, Gb LAN, S-ATA Raid, USB 2.0, IEEE-1394, Dual PCI-E MB - EPU Technology )
Memory ( 4 GB [2 GB X2] DDR2-800 PC6400 Memory Module - Mushkin )
Video Card ( ATI Radeon HD 4890 - 1GB - Single Card )
Case Lighting ( None )
Power Supply ( 650 Watt -- Corsair CMPSU-650TX Power Supply - SLI Ready )
Processor Cooling ( XIGMATEK Dark Knight 120mm CPU Cooling Fan System - H.D.T. (Heat-pipe direct touch) technology )
Video Card Brand ( Major Brand Powered by ATI or NVIDIA )
Primary Hard Drive ( 500 GB HARD DRIVE -- 16M Cache, 7200 RPM, 3.0Gb/s - Single Drive )
Data Hard Drive ( None )
2nd Optical Drive ( None )
Optical Drive ( 22X Dual Format/Double Layer DVD±R/±RW + CD-R/RW Drive - Black )
External Hard Drives [USB 2.0/eSATA] ( None )
Sound Card ( Creative Labs Sound Blaster Audigy SE )
Speaker System ( None )
Network Card ( Onboard LAN Network (Gb or 10/100) )
Wireless Network Adapter ( Zonet ZEW2545 802.11n 130Mbps Wireless USB Adapter )
Floppy Drive ( None )
Monitor ( None )
Operating System ( Microsoft Windows 7 Home Premium + [Free 60-Day !!!] Microsoft Office 2007(Word, Excel, Outlook, PowerPoint, Access ....) - 64-Bit )
Warranty ( Standard Warranty Service - Standard 3-Year Limited Warranty + Lifetime Technical Support )
Rush Service ( Rush Service Fee (not shipping fee) - No Rush Service, Estimate Ship Out in 5~10 Business Days )
Video Camera ( None )
Power Protection ( None )
Headset ( None )
Printer ( None )
Meter Display ( None )
Flash Media Reader/Writer ( None )
MP3/MP4 Player ( None )
USB Flash Drive ( None )
2nd Monitor ( None )
iBUYPOWER Labs - Noise Reduction ( None )
iBUYPOWER Labs - Internal Expansion ( None )
Netbook / Notebook Bundle ( None )
That doesn't include mouse, keyboard, monitor, speakers etc. etc. just everything you need in the tower unit, and a case I'm sure he'd be quite impressed with.
That system would play anything thrown at it very nicely.
Only thing is it comes out a bit over your budget with P&P at $1,061, Gawd they stunt you on P&P. almost $100 for P&P, ridiculous.