Your lack of Guilty Gear disturbs me. That is the best fighting game series hands down, it's essentially Street Fighter on crack and cranked up to 11. SO much depth, such amazing combat, kick ass characters and music, it's a massive bundle of AWESOME.
It trumps every other 2D fighter in my opinion.
And if I have to chose some of my favorite individual games it's have to be Guilty Gear X2 Accent Core, Blazblue Continuum Shift, and Dissidia: Final Fantasy. No other fighter out there comes close the the awesome and sheer fun factor of these games. I love em to death and a all amazing fighters.
Street Fighter and Tekken are ok but they don't have the same level of enjoyment for me. Killer Instinct is awesome and Soul Calibur is always a fun and rather laid back fighter. Oh and Fate Unlimited Codes is pretty damn good if you ever play it.