I'm about to get a brand new set of tubes for my amp, and figured I might as well plot on a speaker swap to get the most out of it. The current options are Eminence Private Jack, Wizard, Man O War and Texas Heat. My question is, when buying a replacement speaker, should I aim to match the Power Wattage of the currently installed Blue Marvel? I believe that has a Power Wattage of 150W, whereas the other speakers (Private Jack, Wizard) have 50W and 75W respectively, and the other two (Man O War and Texas Heat) both have 150W. Also, what would getting a lower Power Wattage do to the amp? Such as the sound, does getting a lower Power Wattage lower my clean headroom before breakup? I'm pretty new to this, it'll be my first time changing out the tubes so thanks for the time.