New system build I7 920

Gigabyte GA-EX58-Extreme Intel X58 (Socket 1366) PCI-Express DDR3 Motherboard Gigabyte GA-EX58-Extreme Intel X58 (Socket 1366) PCI-Express DDR3 Motherboard £249.99
(£217.38) £249.99
(£217.38)
Intel Core i7 920 D0 Stepping (SLBEJ) 2.66Ghz (Nehalem) (Socket LGA1366) - OEM Intel Core i7 920 D0 Stepping (SLBEJ) 2.66Ghz (Nehalem) (Socket LGA1366) - OEM £218.99
(£190.43) £218.99
(£190.43)
Acer X243H 24" Widescreen LCD Monitor Acer X243H 24" Widescreen LCD Monitor £166.99
(£145.21) £166.99
(£145.21)
Asus ATI Radeon HD 4890 1GB GDDR5 PCI-Express Graphics Card Asus ATI Radeon HD 4890 1GB GDDR5 PCI-Express Graphics Card £164.99
(£143.47) £329.98
(£286.94)
Antec CP 850W Modular Power Supply Antec CP 850W Modular Power Supply £104.98
(£91.29) £104.98
(£91.29)
OCZ Gold 6GB (3x2GB) DDR3 2000MHz PC3-16000C10 Low-Voltage Triple Channel (OCZ3G2000LV6GK) OCZ Gold 6GB (3x2GB) DDR3 2000MHz PC3-16000C10 Low-Voltage Triple Channel (OCZ3G2000LV6GK) £97.99
(£85.21) £97.99
(£85.21)
Antec 900 Nine Hundred Ultimate Gaming Case - Black (No PSU) Antec 900 Nine Hundred Ultimate Gaming Case - Black (No PSU) £79.99
(£69.56) £79.99
(£69.56)
Microsoft Windows Vista Home Basic SP1 64-Bit - OEM (66G-02141) Microsoft Windows Vista Home Basic SP1 64-Bit - OEM (66G-02141) £73.59
(£63.99) £73.59
(£63.99)
Noctua NH-U12P SE1366 CPU Cooler (Socket LGA1366) Noctua NH-U12P SE1366 CPU Cooler (Socket LGA1366) £57.99
(£50.43) £57.99
(£50.43)
Hitachi Deskstar P7K500 500GB SATA-II 16MB Cache - OEM (0A35415) Hitachi Deskstar P7K500 500GB SATA-II 16MB Cache - OEM (0A35415) £42.99
(£37.38) £42.99
(£37.38)
Symantec Norton Internet Security Suite 2009 - OEM (14459930) Symantec Norton Internet Security Suite 2009 - OEM (14459930) £17.24
(£14.99) £17.24
(£14.99)
Pioneer DVR-216DBK 20x DVD±RW SATA Dual Layer ReWriter (Black) - OEM Pioneer DVR-216DBK 20x DVD±RW SATA Dual Layer ReWriter (Black) - OEM £16.99
(£14.77) £16.99
(£14.77)

Would all the above work well together?

All looks good, but you could save some money with less of a PSU (Maybe 750W), 850W is overkill.

Also, for the RAM, OCZ Platinum Memory would improve the quality of the build. For the HDD, get a WD Black 640GB 32MB Cache. For the DVD Drive, get a 22x LG Black CAV SATA Optical Drive with LightScribe.