People have a certain affinity for early fighters like Mortal Kombat and Street Fighter 2 and those will always hold a special place but Super Street Fighter IV is the best fighting game out there to date. It uses the same beautiful 3D graphics and 2D fighting from regular Street Fighter IV but introduces new character to the series, Juri and Hakan as well as old favorites from other Street Fighter games such as Ibuki, Makoto, Deejay, Cody, Guy, T. Hawk, Dudley, and Adon. Along with the addition of characters, they reworked and balanced problems from Street Fighter IV and added a second Ultra move to every character.
There's a reason why Street Fighter IV brought back the fighting game genre, it's just simply spectacular. You won't get a better bang for your buck and people will be playing this game online for a long time to come.