Headphones

["Peter Shute" pshute2]

I need some headphones with better isolation than my open back Sennheiser 
HD435s. I'm finding I'm putting off mixing because mostly when I get a chance 
to do it, the house is too noisy. Hopefully some closed headphones will improve 
the situation.

There have been many threads about headphones here over the years, and 
searching through these tells me that Sony MDR7506s and Sennheiser HD280s seem 
very popular, almost a standard. Can anyone advise which of these will block 
out the noise best? Any other comments about either?

And can anyone recommend anywhere to get either for a reasonable price in 
Australia? Most places seem to charge about double the US prices.

Peter Shute