I hear ya, it takes time, for me many years to finally get every piece upgraded, and when it is done start all over upgrading again. Part of the fun though.
There are many in here who have responded already who have plenty more experience cable swapping and upgrading than me, so they will chime in regarding whether it is better to stick to one brand, or mix them up for different flavours. But you have 2 of the most important components covered.
It is nice to just skip the lower end power cables and jump right up to the thousand dollar ones (+), as that makes a more memorable impact (as you just witnessed) but I don’t think it’s a bad idea to find some used Audio Sensibility statement’s for example on CanuckAudio at a good price in the mean time as you will most likely be able to sell them for what you paid for them, as they hold their value well and are popular in Canada, and it helps train your ears and keep you satisfied for short time periods. Decisions decisions. In the mean time enjoy re-discovering all those tunes you thought you knew well. 😎