Making my mind up
 

I've been having a good look around at the different options for my next lens purchase and have decided (probably!) on the Sigma 100-300 f4 HSM. I was looking at the Nikon 300 f4, which is a superb lens, but I think the Sigma would be more useful (being a zoom) and even works well with a 1.4 TC which I would buy at the same time.

I'm amazed by the different prices out there, this lens can be bought from HK for as little as £500 with a 2 year international warranty, whereas it's about £200+ more in the UK.

Thoughts and advice please.