I upgraded the 1.0 uf to trt caps and the cabinet damping to black hole.
What differences did you notice in sound quality after these upgrades were made?
You'll probably have to measure the crossover components yourself to ascertain the values of the caps and inductors. I'd suggest that if you really wanna upgrade the crossover, focus on the caps.
Also, why would you like to replace the tweeters? Is there a problem with the current ones?
BTW -- I wouldn't worry about upgrading the woofers. They seem to be built to last and should sound great for a few more years.