From your link above, HP is more expensive than the other, don't get that...
From, asus machine customer review, it was only 500W PSU inside, not recommend if you want to upgrade.
So, you either get the gateway or cyberpowerpc
Alternatively, go to cyberpowerpc to customize it and you will know what exactly the PSU in the machine such that no worry about if it fit in Europe.
http://www.cyberpowerpc.com/system/Mega_Special_IV
$1208
CASE: CoolerMaster Centurion 590 RC-590 Mid-Tower Case
Neon Light Upgrade: NONE
Extra Case Fan Upgrade: Default case fans
POWER SUPPLY Upgrade: Corsair Power Supplies (750 Watts CMPSU-750TX - Quad SLI Ready)
CPU: Intel® Core™ i7-920 2.66 GHz 8M L3 Cache LGA1366
COOLING FAN : Intel LGA1366 Certified CPU Fan & Heatsink
MOTHERBOARD: Asus P6T SE Intel X58 Chipset CrossFireX Mainboard Triple-Channel DDR3/1600 SATA RAID w/ eSATA, GbLAN, USB2.0, IEEE1394a, &7.1Audio
MEMORY: 6GB (2GBx3) PC1333 DDR3 PC3 10666 Triple Channel Memory (Corsair or Major Brand)
FREEBIES: None
VIDEO CARD: NVIDIA GeForce GTX260 CORE 216 896MB 16X PCI Express (Major Brand Powered by NVIDIA)
VIDEO CARD 2: None
VIDEO CARD 3: None
Free Game: None
MULTIPLE VIDEO CARD SETTINGS: Non-SLI/Non-CrossFireX Mode Supports Multiple Monitors
LCD Monitor: NONE
2nd Monitor: NONE
HARD DRIVE: Single Hard Drive (500GB SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD)
Data Hard Drive: NONE
USB PORTABLE DRIVE: NONE
Optical Drive: (Special Price) LG 22X DVD±R/±RW + CD-R/RW Dual Layer Drive (BLACK COLOR)
Optical Drive 2: NONE
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
SPEAKERS: None
NETWORK: Onboard Gigabit LAN Network
MODEM: NONE
KEYBOARD: Xtreme Gear (Black Color) Multimedia/Internet USB Keyboard
MOUSE: XtremeGear Optical USB 3 Buttons Gaming Mouse
Extra Thermal Display : NONE
Wireless 802.11B/G Network Card: NONE
Flash Media Reader/Writer: None
VIDEO CAMERA: NONE
PRINTER: None
PRINTER CABLE: None
IEEE CARD: NONE
USB PORT: Built-in USB 2.0 Ports
FLOPPY: NONE
OS: Microsoft® Windows Vista™ Home Premium w/ Service Pack 1 (64-bit Edition)
Windows 7 Upgrade Coupon: (Free Upgrade Coupon) Microsoft® Windows® 7 Home Premium ($29-$29 Mail-In-Rebate = Free) (64-bit Edition)
FREEBIES: None
Media Center Remote Control & TV Tuner: None
SERVICE: STANDARD WARRANTY: 3-YEAR LIMITED WARRANTY PLUS LIFE-TIME TECHNICAL SUPPORT
RUSH SERVICE: NO; READY TO SHIP IN 5~10 BUSINESS DAYS
