I have travelled miles to shop and eat. Singapore is a place to bargain. This is my approach to buying electronics. Buy the newest and latest but make sure you do your research. I dont like to keep electronic goods like digital cameras for more than a year. Check prices online and on ebay. Make sure you can resell it online for minimal loss in a year.
If the model can be bought in America, it is probable that you can get a good deal out in America. Make sure you buy top of the line in Asia, because one year later it will remain the top of the line in America and thus easy disposal on ebay.
NRT is a pile of crap. The store looks good in the airport. You are better off paying the 200 yen to go online and doing some research at the internet cafe right opposite the store.
Singapore I do not remember where I went to. it was this place on Orchard. This mall sold electronics and only electronics. You have to bargain. Contact me if you need help. I love to shop. I mean that.