Given the infinite number of possibilities, I think it breaks down to 3 general considerations:
1) keep your speakers
2) upgrade them ((spend $6k)
3) consider performance upgrades for your existing speakers. For about 20% of the cost of an upgrade you can enjoy more of what the original designer of your speakers intended IF the budget and technology were available at the time. Replacing production grade older xover parts with newer/better stuff (along with better cabling and connection/termination methods)will bring out a level of detail and transparency you never thought possible. If the values are kept the same as the original, the general character of the speakers will remain. Just infinitely more musical.