sony 70-400 G SSM...around the £1200+mark
These are a great budget lens: http://www.dixons.co.uk/gbuk/tamron...-mount-03885256-pdt.html?srcid=867&xtor=AL-78
Nice colours and contrast, and it's very light weight! Sadly, it has slow AF and it hunts like mad in low light. Unless you spend the big bucks, it'll probably be the same with most cheap lenses tbh!
I'll go along with this ^^
Beercans appear to have achieved legendary status recently, but people who have owned both the tamron and the beercan appear to still rate the tamron highly.