Not sure about "cabinet" : do you mean a desktop computer case, a computer desk, or an actual cabinet for storing things?
What size?
What products are you considering? Provide links if possible.
) "Best" is subjective. What do you like: colors, style, design, size, shape, etc.?
2) Value for money: you have a budget (3000INR) which is good. Still there may be trade offs involved if you are budgeted at the low end of the pricing range.
Read product reviews via professional reviewers and certified purchasers. Find out what they like and do not like about the cabinet.
However, the only way to know is to actually look at the cabinet(s) to see how well they are constructed, what materials are used, strength, durability, etc..