Which site provides the best 1 min intraday charts for NSE?

General
1

Preferably with buy and sell call signals.

2

If you are asking for a website, you can check out TradersCockpit. 

3

Google finance also does a good job, if you choose OHLC(settings->Chart type->OHLC you will get 2 min, 3min, 5 min charts. It is near real time. It is not 1min as you asked. But just one more source were you can visualize the charts.

4

It is possible that you can download one min data table from Google Finance for last 15 days.
Later plot it on excel to have a look at the chart!
Just fyip.