I am considering purchasing a pair of cornwalls but was just wondering if i should save my money and save up for a pair of La Scalla's? I will be using them for only HT. I already have a pair of herseys, i plan to use one of them as a center. Also if i do go with the cornwalls, what are some things i could do to upgrade them? Replace the xovers? Woffers? or mid and tweeter?