I believe you are doing the right thing. You already know that you very much like the sound of the Vienna Acoustics Hadyn speakers driven by your Sony receiver. By putting your money into the speakers, you are investing in the part of your home theater system that makes the most difference in the sound you hear. Don't let some elitest tell you that your system is not good enough when your own ears tell you otherwise. Later, when you have additional money for another upgrade, you can try better components and see if you hear improvement in the sound.