Everyone of us now wants to be online and access Facebook and share our life on twitter but for that we need a computer. And if your budget is up Rs. 20,000 than you can buy either a netbook or a desktop. This depends on the fact that whether you will be using Internet on the go or at your home. If you want Internet access only at home than go for desktop. Building a desktop below Rs. 20,000 is always a challenging thing and you have to compromise on many things.