I currently have

Processor AMD Phenom™ 8450 Processor, 64-bit Triple Core Processor
•Each core operates at 2.10 GHz
•2 MB shared L3 cache
•3600 MHz HT 3.0 system bus

Chipset AMD RS780 consisting of:
•Northbridge: RS780
•Southbridge: SB700

Memory •Installed: 4096 MB DDR2 667 MHz (PC-5300) dual channel SDRAM (two 2048 MB modules)
•Expandable to: 8 GB (4 DIMM slots)

Hard Drive 500 GB 7200 RPM SATA II hard drive
Support for up to two hard drives
Optical Drive 18X DVD ±R/RW super multi format drive featuring Labelflash™ technology (up to 8.5 GB)
Supports Labelflash on disc printing (requires Labelflash media)
Media Card Reader 15-in-1 high speed digital media manager with Smart Copy button supporting the following:
•Compact Flash™ (CF) I, II
•IBM Microdrive™ (MD)
•SmartMedia™ Card (SMC)
•Memory Stick™ (MS)
•Memory Stick Duo™ (MS Duo)
•Memory Stick PRO™ (MS PRO)
•Memory Stick PRO Duo™ (MS PRO Duo)
•Secure Digital™ (SD)
•Mini Secure Digital (MiniSD)
•Multi Media Card (MMC)
•RS Multi Media Card (RS-MMC) (need adapter)
•Multi Media Plus Card (MMC Plus)
•Multi Media Mobile Card (MMC Mobile)
•xD-Picture Card™ (xD)

Video Integrated ATI® Radeon™ HD 3200 graphics
Up to 256 MB shared video memory
Audio Integrated 8-Channel (7.1) High Definition Audio
Network Support Integrated 10/100/1000 Mbps Marvell 8071 / 8075 Ethernet LAN
Modem 56K ITU V.92 ready Fax/Modem
Power Supply 300 watt
Add-in Card Slots •One PCI Express ×16 (graphics interface)
•One PCI Express ×1
•Two PCI conventional

External Connectors •One PS/2 keyboard port
•One PS/2 mouse port
•One VGA monitor port
•One HDMI port
•Six USB ports (four rear, two front)
•One IEEE 1394a ports (rear)
•One RJ-45 Ethernet LAN port
•Eight audio jacks (six rear, two front)

Drive Bays •Two external 5.25-inch
•One external 3.5-inch (with a docking bay for optional Gateway 2.5-inch removable USB hard drive)
•Two internal 3.5-inch (hard drive)

Physical Dimensions
(H × W × D) 15.6 × 7.2 × 16.1 inches
Weight (Unpackaged) Minimum 23.4 lbs. (varies with configuration)

What all would have to be replaced to handle 5 boxing without any problems.
I would prefer to just upgrade my pc unless it would be cheaper and better to just buy the following
http://www.bestbuy.com/site/HP+-+Fac...&skuId=1177091

thanks