I own the M3 Turbo S' and I did upgrade the 6.8uf and the 68uf capacitors using Jupiter capacitors and yes it was expensive, but wow, the sound quality is so much improved.
I can solder a bit, but am no expert either in soldering or knowing anything about electronics/crossovers, so a LOT of trepidation. BUT, now that it's done I can honestly say that from my perspective, crossovers should be considered as components and using more expensive quality parts makes a HUGE difference in defining what your speakers are capable of.
I plan to upgrade the wire, but first I need to wait a month or two to let these caps settle in.
Yes, the warranties are voided, but parts are always available and I am planning to keep mine for a long long time.
My recommendation would be to upgrade the caps with whatever you can afford--remember that the crossover is the last thing your speakers are filtered through, and the Dayton Audio parts are small and fit in the small cavity to make it more attractive, but you don't really know what your speakers can do until you upgrade with higher quality parts.
As far as the wiring to the speakers, it will help some (I'm assuming) but the real difference is in the crossover parts. I believe the Triode Master also has some crossover upgrades, and that may be why they sound better, just a guess. P.S. my crossovers are about 7"x9"x5" and weigh about 8lbs. Out of curiosity, I put a few Herbies footers under them and did hear a difference, which means I plan to get some IsoAcoustics footers for them as well....