Worth upgrading my cables?

I would have to say yes, a very very high probability. Given you are happy with your components sound… great. That is where you want to start.

I do, speaker cables first, then amp power cord, then interconnects, then other power cords.

I would recommend either borrow, rent, or check out some high end speaker cables. Brands that I would try… DHLabs (great value for money, I usually do these until I know where I want to go), Cardas (tend to be very musical and warm), Wire World, AudioQuest, and Transparent cover the gamut.

You have to try them and only buy if you hear a difference worth the investment. It is hard to say, “buy this” because your system isn’t the same as anybody else’s. It makes a difference. I have their many Nordost… some have been the best I ever heard, some OK, and one particular in between my streamer and DAC… simply horrible. I personally use Transparent almost exclusively. They are extremely… well, transparent… but for my components… perfect.

All my interconnects… cables and power cords have provided value commiserate with their price. For instance my speaker cables were $5k, connection $32K speakers with a $22K amp… the increase in performance very much worth the cost. It is not atypical that your wires comprise 10 - 15% of your system. I don’t start working on these until I have the components that sound perfect to me… then I can get another 10 - 20% additional performance out of mt\y system. The better your system, typically the more you can get out of wires.

You have good wire already.  Depending on what you replace with, you may notice a difference, but you may not prefer it, or there may be no difference at all.  

I'm of the school that I'll put my money towards components first while have well constructed cables. I use Mogami wire for just about everything - RCA, XLR, and speakers. For power cables I use Pangea plus home-made cables using high quality  Furutech wire and connectors.

Can I do better?  Dunno but I'm okay with that

Thanks for all the feedback. Nice to see the full gambit of audiophile responses. My suspicion is that my current wires are about 70-80% as good as the rest of my system and while there is likely room to gain subtle improvement it may not be the best bang for the buck. Really the root of my question is... I'm I holding my current components back by not upgrading my cabling? 

If you want just a bit more bass to the sound. Add a furutech NCF rhodium connector to the power cord connected to you amplifier/dac. The carbon fibre/stainless one is the best one.[pricey but cheaper than changing cables]. I also have furutech NCF silvers to boost mids and treble. My power cords are Black Cat Silver.