I always upgrade speakers (every 2 or 3 cycles) first, then components, then cables, interconnects, power cords last. This reflects the typical degree of effect on tne sound. Occationally an interconnect or cable will have a large outsized effect… but not typically.
So, over time the interconnects would typically represent 10 - 20% the value of the component. I usually try enough different brands to make sure they sound the best. So, at this point my speakers cost $32K - cables $5K, average component cost $20K, interconnects $3K, and average power cord $1.2K.
I have tried a variety of interconnects. For instance, a $17K interconnect on a $17K component. The difference was subtle but important. I was not remotely tempted because a $34K component would have netted a huge improvement in sound … while tne same investment in interconnect was minuscule in comparison.