I am planning to buy a new lap top.. i will be usign this computer to do create power point presentation and may be opening 5-8 files together for multiple processing.. these files can be documents, excel files or power point files.. making links in one file from another... i will be using low res photos in the power point files also.. should I go for i3 4th generation or i5 3rd generation.. the difference is Rs. 10,000.. ($165)... please advise