How to allocate my cable dollars.

The 'common sense' approach is to spend about 10% of you system cost on total cost of all cables.
Agree speaker cables can wait.
Pangea AC-9 for amps (if they have IEC connectors)
Shunyata Venom for others.

a variety of low price but good quality cables are available, like Blue Jean. Or Kimber PBJ or Hero.

I second trying a power conditioner IF you value clarity, and upper frequency smoothness, and accept a little tighter bass (less boomy). A conditioner can do a lot for pic on screen too. (I would experiment with used cheaper conditioners.. look for a $100 Adcom to play around with, or a midline Monster. Not to settle for, but to see for yourself what they do. Before you spend big bucks on just one.
(I settled on two multi thousand $$$ ones I bought used... Furman REF20i and PS Audio P600)
Anyway, better to fiddle with cheaper cables and learn what they do FOR YOU than accept one persons notion of what you need...

Interconnect from the source and power cord for the preamp are very important. Then the interconnect from the preamp and power cord for the source. Then speaker cables. Then power cord for the amp. Playing with power conditioners would be the last thing to do when the system is complete.
As for the proportions, I advocate the figure of about 20% the cost of entire system not 10%. This doesn't include power conditioners.

I would focus on ICs, then speaker wire, and only then mess with power cords. IMO the dedicated lines I ran did as much or more as any power cords or condtioner. I do have upgraded PCs and a cheap conditioner but the differences were not as great as the ICs and speaker wire. Another thing is on the lower end ICs the xlrs are much cleaner than rcas IMO.

I'm more on line with 20% too. This probably doesn't include the QX4 and QB8. Only you can judge and try to it with some sort of blind comparison. The changes are typically not shocking but should be closer to natural if that makes sense.

I've been playing with cables for a while, and settled on spending about equal on interconnects and speaker cables, about half that on power cables. I guess if you work it out, that's about equal for each individual cable (since power cables are singles).

In order of impact - interconnects, power cable, speaker cable.

Total of about 20% of your system is good.

A decent HDMI cable is worth it, as others have said.