@John: I don't think I will be able to make it this week Mum's birthday.
@Colin:
Case Antec Minuet 350 Slimline case with 350W PSU $133.00
PSU ^^^^^
Mobo Gigabyte GA-P55M-UD2 P55 4DDR3 4VRM PCIEx16 GLAN DES2 8SATA 2X1394a mATX $133.50
CPU Intel Core i7 860 Processor LGA1156 2.8GHz 8MB Cache CPU $334.00
Ram Kingston 4GB(2 X 2GB) DDR3-1333MHZ $125.00
HDD Samsung 1.5TB Silencer Series 32M $133.00
DVD Samsung 22X DVDRW Black SATA (SH-S223C-BL) $37.00
VGA Inno3D GTX 260+ (216SP) PCI-E 2.0 896MB DDR3 DVI HDCP $228.00
Monitor Samsung P2350 23 $237.00
OS Microsoft Windows 7 Pro 64bit OEM(Microsoft OEM Terms&condition apply) $169.00
$1,529.50
Will shit all over that HP, but no touch and it will take up a little more room. Although that is using the smallest case I could find. No keyboard or mouse in that shit either - do you need them?
You can shave a bit of cost off if necessary with either a smaller hard drive, windows home edition, or a less powerful video card.