Joining Big4 firms

HI Friends,

I wrote my PCE this november and awiating results. Meanwhile i was thinking to join big 4 firm by quiting the present, which is a quite a small one. I came up with this idea in order to shape my future career in proper form. I would like to know whether at all is it right time to join a big 4  firms after doing the articles in a smaller one keeping in mind the work load and time for study. It would be very help full to me if you post ur suggession in this regard, in taking a step towards my future.

Thank You