Viewnet is fine.

Last time I went Sri Computer, they also got some Armageddon on display.

All the switches are good. Only you can decide which switch is better. Try them out.
Brown are generally preferred because blues have trouble with double taps and quick tapping because the reset point is furthur away from the actuation point compared to other switches and blacks are too heavy for many. But some people can game with blues, so get what is best for you.

Yup. Try 1st, maybe you will like other MX switches too.
Brown ah? This really up to each individual preferences.
Some people use MX brown for main typing keyboard. Some people blue, red and etc etc.
Already have the brand in mind you want to buy which keyboard? Refer to the first page for more info.