If it is LCD monitor and not LCD TV than there will be no Customs duty .But other duty like central excise duty 14%,education cess 3% and Additional duty of 4% will be collected.The central excise duty is also calculated based on MRP price in India by giving 23% abatment on declared MRP price.Which ever duty is more ,central excise duty based on 14% or the MRP based duty,will be taken as excise duty.
The rate of duty on LCD monitor for computer is same whether it is imported or manufactured in India.The deciding factor is the price in India,service after sales and availability of particular brand in INDIA.Based on above fact, you may decide whether you have to buy in India or abroad.
Ravindra Kumar