Okay...right...so as far as the circuit is concerned, a single non-polar 5uF cap is going appear the same as two back-to-back 10uF polar caps.
BUT...
I don't have any 5uF non-polar caps...would 10uF be okay or even desirable? 22uF? its an input coupling cap and I thought that going bigger might be an advantage. Its interesting...outside of the PSU filter caps, all the electrolytic caps are 10uF/16V...and outside of the input coupling caps there are NO electrolytic coupling caps in the entire circuit.
Must know...must finish it...must not let IT sit unfinished...
And, Greg, so putting something like a good quality 0.1uF metal film cap in parallel with each of the 470uF and 1000uF caps couldn't hurt right?