here is an idea a custom build of similar money would get you a machine that would connect to a hi def television for that full screen usage, with plenty of scope to upgrade in the future if needed and would only cost £542.29 unless aria would charge much more for delivery, and for that price it contains the following things.
Gigabyte Motherboard, DDR3 1333 (max 32GB), 2x USB3.0, 12x USB2.0, 2x SATA 6Gb/s, 3x SATA 3Gb/s, 2x PCI-E x16 (single at x16 or dual x16/x4), 7.1 Channel HD Audio, Multi VGA Output options: D-Sub, DVI-D and HDMI.
http://www.aria.co.uk/Products/Components/Motherboards/Intel+1155+H67/Gigabyte+GA-H67MA-D2H+Intel+H67+%28Socket+1155%29+DDR3+PCI-Express+Motherboard+?productId=43407
intel icore i5 3.5ghz
http://www.aria.co.uk/Products/Components/CPUs+%2F+Processors/Intel+Core+I5+%281155%29/Intel+Core+i5-2500K+3.30GHz+%28Sandybridge%29+Socket+LGA1155+Processor+-+Retail+?productId=43216
2gb memory ddr3 pc310666
http://www.aria.co.uk/Products/Components/Memory/DDR3+Single+Modules/2GB+Kingston+HyperX+Blu+%281x2GB%29+PC3-10666C9+1333MHz+Memory+Module+%28KHX1333C9D3B1%2F2G%29+?productId=42420
blu-ray drive to play blu rays etc,
http://www.aria.co.uk/Products/Components/CD%2FDVD+Drives/HD%2FDVD+BluRay/LiteOn+iHOS104-37+4x+BD-ROM+Drive+%2F+8x+DVD-ROM+%28Black%29+-+OEM+?productId=37131
dvd burner just incase yo want to make backups etc
http://www.aria.co.uk/Products/Components/CD%2FDVD+Drives/Internal/SATA/LG+DVD+Writer%2C+GH22NS50%2C+SATA%2C+Black%2C+OEM+?productId=37292
1tb hard drive
http://www.aria.co.uk/Products/Components/Hard+Drives/Notebook+-+2.5%26quot%3B/SATA/1TB+Samsung+Spinpoint+MT2+2.5%22+Laptop+SATA+II+Hard+Drive+?productId=41591
case
http://www.aria.co.uk/Products/Components/Cases/MIDI+Tower/Xigmatek+Asgard+Pure+Black+Edition+Gaming+Case?productId=38515
power supply
http://www.aria.co.uk/Products/Components/Power+Supplies/650W+or+less/Corsair+Builder+Series+430CX+Power+Supply+?productId=42487
official win 7
http://www.aria.co.uk/Products/Software/Operating+Systems/Microsoft+Windows+7+Home+Premium+64+Bit+-+OEM+?productId=38272
Against the one you had pointed out this would be just a tower, the ram is a little lower on the spec i have put but that could be done to match more, however the processor is more than quad core and with 7.1 sound with hdmi, dvi and vga you could use more than one screen easily.