I used Bellesons in an amp because of the high current option. I decided on the cheaper DEXAs for the DAC. Both seem to be good.
The output caps are 100u/25V everywhere. You can get away with not using any on the reg outputs. You won't be able to fit film caps on the audio out as there's not enough space. You'll have to choose a nice 'lytic.
I put Nichicon KWs on the power supply and i think you can squeeze in 6800u sized ones if you wanted.
The voltage in the unit is nowhere near 35V but it's wise to stick to stock specs.