Phone buying advice

I am planning to buy a phone. My budget is somewhere around 20,000 - 25,000.

The features I am looking for in a phone are as below:

1. Minimum 1.5 GB RAM
2. Good Camera Specs
3. Dual SIM
4. Good Battery life (Min 1 day)
5. Good performance. Negligible lag. Good Processor.

I am very much interested in HTC Desire 820 but am a little skeptical to use a phone with 5.5" display as I have not used a bigger display before. I also read about heating problems in HTC.

Please suggest I should still go for HTC 820 or if there is any other option.

Thanks in advance