I am now currently using the Z323 speakers and wondering if the Z506 speakers is worth the upgrade. I'll be mainly using it for gaming, movies, music, etc. and i want more bass without giving up the treble (Z323 default was okay but not good enough, had to EQ it for awhile to get a decent sound). Is the Z506 way better than the Z323, or just a little better? Is the 5.1 surround sound worth?