The Opening I recommand with white is Pf3 and with black Modern Benoni and Najdorf.
White: Pf3 avoids nasty openings like Albin and Budapester, and you can mostly transpose to Queens gambit, and Symmetrical English (Pf3 avoids c4 e5!). Also there are some lines that avoids Grunfeld, by inserting an early e4 instead of d4. Thus in conclusion you need to be prepared for:
Queens Gambit
Benoni
Kings Indian
Symmetrical English
With Black:
Najdorf against e4 ofcourse and Modern Benoni against d4. I think this is a good repetoire.
Good luck!