What are the softwares to learn?

I am doing my BE mech engg 2nd year in a reputed university... I am interested in design field.... I need to b strong in that.. I hav already learnt AUTO-CAD (2d and 3d) ... I need to learn one more modelling software and an anlaysis software... Ansys is my option for latter one... But der r lots of modelling softwares lik pro-e, solidworks, catia.. Which one to learn?? Or shud i go for NX or inventor softwares?? m really confused.. I dont think learnin just several modellin softwares wil serve a purpose.. Which software is widely used in india??