Hi,
For a smidge more than the £379.99 you could build your own with a fairly similar spec.,
and be sure that it's got quality components in critical areas like PSU and RAM.
I just built a PC for my brother and it totaled @ £395.93.
AMD Phenom II X2 550 @ 3.1Ghz + Asus M4A785D-M Pro board.
Win7 64 bit, 1Tb Seagate disk, onboard sound and graphics, (only!) 2Gb RAM from Crucial,
Microsoft Wireless Mouse + Keyboard, Antek Case + 430 Watt PSU.
But no wireless LAN - already had Netgear dongle.
Beware that Win7 might not support your existing peripherals.
Had to install a virtual Win2k (using VMWare Player) on brother's PC to support his old HP Scanner.
HP didn't bother to provide Win7 drivers.
Luckily he had a Win2k licence and disks from his old PC.
And if you run the Windows 7 Upgrade Advisor -
http://tinyurl.com/37lhlq2 - to check if your peripherals are supported - beware! It lies!
It claimed my HP Laserjet 1010 is supported by HP with Win7 drivers. HP say it isn't.
Check carefully on the peripheral suppliers websites for Win7 drivers.
And even then sometimes only 32bit supported, no 64bit.
Cheers,
Peter