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					Originally Posted by petrochemist  I don't use Nikon but my experience is modern stabilization systems are good for at least 3 stops, whilst the f2.8 lenses will only give you 1 stop extra.You will probably find the new body will tolerate higher ISO before noise becomes an issue so low light should be less of an issue anyway.
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 Thx for that yes of course the d5100 performs exeptionally at higher iso than my d40 so i think i ill go for the Sigma 70-200 f2.8 OS £900 and Sigma 18-125mm f3.8-5.6 DC OS HSM £250 then i have a decent  18-200 stabilised range and a nice f2.8 too. i can pop the 18-125 on my d40.