rule of thumb: most prebuilt pc's svck at gaming.
the one you show is not much different. the CPU is a last gen dual-core. AAA titles release this year (including crysis 2) use quad core so the CPU in that all-in-one (please get a real desktop) is already hindered.
second, the HD 5570 is a joke. that card is only good for very light games such as the ones using the aging source engine (released in 2004) with all graphics at minimum.
I suggest you use that 1000 to build a realistic gaming machine with lastest core i5 2500K and at least a GTX 560 Ti or HD 6870 if you want to play games.
Thanks and others for letting me know, I definitely won't be getting this PC now

I have been on the Dell Online Store Builder looking at the Alienware computers (http://configure.euro.dell.com/dellstore/config.aspx?oc=d00asw09&c=uk&l=en&s=dhs&cs=ukdhs1&model_id=alienware-aurora-r3&cid=pd_ukdhsalwnar3d00asw09) and have custom built this PC. Do you think this is good enough?
3.4GHz Intel? Core? i7-2600K (8MB Cache) Quad Core Processor with overclocked Turbo Boost to 3.9GHz
English Genuine Windows? 7 Home Premium (64 BIT)
1.5GB NVIDIA? GeForce? GTX 580
6GB 1333MHz (2x2GB + 2x1GB) Dual Channel Memory
500GB - SATA-II, 7,200rpm, 16MB Cache
802.11n WiFi and Bluetooth 2.1 EDR USB Combo Adapter - EUR
DVD+/-RW (Read/Write) 24x
This will set me back £1463.58. It comes with a bit more but these are the main stats.
I know building a PC is a bit cheaper but I really don't want to learn how to build a pc and I don't have the capital right now to buy all the components etc.
Thanks
Kaz
Go to scan as wrath above mentioned and configure a prebuild on there, you'll save money compared to dell.
Pre-built systems are generally going to cost more, as well as the fact you'll have to deal with some companies scrimping on important parts like power supplies etc. That's why if you put a system together you'll not only save money but you won't have to deal with hardware failures due to cheap unbranded PSU's or what not because some idiot at a PC store or the place that builds them thought he'd make more money by scrimping on parts and selling it at the same price. That's probably far fetched but it happens, the majority of cheap prebuilt PC's out there these days are scrimped for profit and most of the end consumers aren't getting their monies worth for the price they've paid.
If you are going to buy a pre-built system make sure it's from a trusted seller that deals with PC enthusiasts as their main customers. Places like scan and overclockers.co.uk are probably where I'd first go for a pre-build.