Query on water pressure problem

Pressure Pump information needed

Hi,

I lives in a 3BHK in Bangalore on 3rd Floor(top floor) and we have an overhead tank for supply, and we have added a Kranti Water meter now.
the problem is that the pressure is very low and when water taps are opened simultaneously in other bathrom, it becomes too low. I have researched on the internet & learned that there are pressure pump available to boost water supply.

Which one should I choose ? As after the water meter installation I have 4 outlets , 3 in bathrooms and 1in the kitchen , plus I don't want to give pressure outlet to kitchen as maids can waste a lot of water.

Please suggest how I can design a solution ? There are 2 Kirloskar models,  should I go for 1 HP or 0.5 HP ? They switch on automatically when tap is opened. The links I have referred to are here:
http://www.snapdeal.com/product/kirloskar-water-pump-in-line/1177870
http://www.snapdeal.com/product/kirloskar-1hp-pressure-pump-jalraaj/2089796678
 
Thanks in advance

Shalini

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