@Hyfi - did something similar a number of years ago. would add a few comments..
1. the wallet can get really thin fast, depending on what you are buying.
2. I heard more of an improvement on SS gear than tube gear changing out power cords.
3. would suggest you beg, borrow a shunyata annaconda power cord. As far as power cords go, they were among the best.
Back in my sand days (SS gear) i had 4 Anacondas - one on the preamp, two on each monoblock and one on the DAC. I was in awe at the SQ improvement.
when I sold off all the SS gear, and bought tube gear, there was still some improvement using the shunyatas, but no where near as much as with SS gear.
good luck...its a murky pond you are wading into.
best.