in my quest for overall SQ I have only done one system. Alpine type s components with kicker 5x9's in my low budget beretta. Now that I'm upgrading to a lexus, I would like to creat a much better soundstage over the factory 6 1/2" front drivers, 4" rear drivers and 8 in factory sub. I listen to mostly metal and alternative, which in my current setup sounds ok but I'm missing the lower mid range. In my beretta the 6x9's do the trick, but I'm wondering if there's a better choice for good lower mid range.