I don't mean this in a nasty way, but whatever the reason for you thinking that your true rating should be around 1500 USCF, it's wrong. You're not 1500.
I don't know anything about any of those openings. I recommend the either the QGD or the QGA as I believe that they will help to teach you the principle of chess the fastest. That's my advice, obviously the decision is yours. I guarantee you though, you're not 1500.
Hello,
I have been trying to find an opening for Black to use against 1. d4, and so far I have narrowed down my potential options (based on soundness and how much I like the openings) to the Grunfeld Defense and the Budapest Gambit (with Dutch Defense being an OK alternative). I am approximately 1500 USCF strength (this is based on tournament results against strong players, since my rating is currently way deflated) in long OTB time controls. I play King's Gambit as White and Sicilian Dragon as Black against 1. e4 (although I plan on switching to Sicilian Najdorf eventually). As you can see from my choice of openings I like very tactical play. What are your recommendations (advice on studying openings in general are also appreciated)?