If you want really excellent warranty coverage in the UK, EVGA is your best bet. Three years as standard, five or ten if you register your details within 30 days of purchase. MSI only offer 1 or 2 years (they are quality though). I'd personally go with EVGA, though you'd need to switch to a GeForce - they don't do Radeons.
Got my msi 7850 2gb the other day, looks great, runs cool, quiet and overclocks like a beast, 2 year warranty for uk aswell so it will last you. Its also full metal card unlike other brands which are plastic so get msi, trust me
Also you should consider if you want a reference card or not. Non reference cards usually offer better cooling. If you want good cooling then stay away from eVga cause most of there stuff are reference.