As long as your internet plan is under the 43Mb/s down, and 10Mb/s up you will not see any difference in getting a new modem.
perfect thanks for the quick response I appreciate your time and help.
Now Time Warner here in Austin is increasing my speeds to 100/10 for free next month because Google Fiber is moving to town. I'm assuming at that point it would be worth it to upgrade to that modem ? Of course time warner will be upgrading modems when they roll out the new speeds in my neighborhood.