I play a SR300, and I am generally satisfied with it. I do know that I prefer playing the Ibanez basses because of the way they feel in my hand. Here's my question: I know the the SR300 is basically an entry-level bass. What model in the SR series would be considered to be in the middle-level category? After reading all that I can, it looks like I would need to move to at least the SR500 or higher to get anything of significance in improvement of quality/playablity.