I used to have 15/5 for Verizon Fios and upgraded to 75/35. Usually there are 2 people streaming and 2 people playing online (one is connected by ethernet). I want to know if with my newer speed (and getting a new router whihc is the wireless N one while I had the one that originally came with Fios when ti first came out) will my internet connection finally be fixed.

My biggest issue is when I am on my computer and I am playing a game and I try to stream netflix my game lags ( I play Diablo 3).

Will 75/35 be enough or should I get 150/75?
I will try the port forwarding when I get my new router. Thanks for the tip.