Jack,
I do Klipsch and other speaker manufacturer crossover upgrades. Typically what I do is, I walk you through getting the crossovers out of the speakers and then you just mail them to me. We would talk about the level of upgrade (e.g. film and foil caps, metallized polypropelene or PIO's). If I can pre-order the parts, I can do the mods in one evening and get them back out to you the next day.
There is NO DOUBT that upgrading my speaker crossovers brought me the most sonic benefits, more than any IC, PC or speaker cable. The crossover upgrade is across the entire frequency spectrum (high, mids, lows).
My upgrades have never exceeded $275 and without looking at a schematic, I would say to do your pair would probably be around the $200 area, and maybe less.
If your interested in talking about this more, email me at:
mvansloten@gmail.com
I'll give you my phone number and I try and answer all your questions. I will even send you before and after pictures so you can see my work.
Thanks,
Mike