Plasma is still the best until OLED prices come down which will take a minimum of 3 more years. Plasma has the best blacks and viewing angles. Going off center when viewing an LED will result in a loss of color. If you have a party, people sitting on the sides have poor color on LED.
The only real problem with plasma is that they produce heat. It's hot where I live most months, so I wouldn't get one. Your model is known to have a buzzing sound. If you don't have the buzz, you have a good model.
My suggestion is keep the TV but buy the Best Buy or Square Trade insurance. If it breaks within 3 years, you get a full refund for money toward an OLED. Technology always changes and I feel right not is the time to buy something to hold you over for OLED. Next year's new tech will be quantum dots but plasma screen will still have better quality. Quantum dots are to help LED screen viewing angles and color be on par with plasma.