Maybe I just need to go listen to other higher end setups and see if something is missing in mine.
I wish more people came to this realization. It has definitely helped me understand what to expect when upgrading. Generally, when I listen to others' systems, I hear things I don't like but, then I hear something I DO like. Once identified, I try to obtain the 'solution' in my system.
So, basically, I go looking for problems that didn't exist and then spend money to solve them.

I haven't heard your particular Polk's but, I have never heard a pair that were very convincing... including the pretty new blue ones that some hifi shops carry now.
I would highly recommend taking your own advice and listen for sounds that you consider lifelike, convincing, true to life, and/or other adjectives that you didn't even know you'd like. Put the money aside for now. You'll need it to add to the other thousands you'll end up wanting to spend.
Good luck!