Where are you posting from? 20K-30k US is a lot of money. Knowing where you are helps to make recommendations based on what is available in your area.
That being said, the Pioneer C22 gets a lot of complaints by users on these forums. There are a lot of options that will outperform the Pioneer center. I would begin by looking at major brands like Elac, Klipsch, Q Acoutsics, among others. I would also include SVS center speakers since you have an SVS sub which means that brand is available to you as well. Good luck on your search I'm sure you will find a center that is definitely better than the one you are currently using.