Re: Best way to power pedals?
I'll second (or third, fourth, ...) the OneSpot for your needs, just get the combo pack and it will have all the adapters you need. It is a digital switching power supply, so it has noise, but the noise is way above hearing range, and probably above the frequency response of the pedals, so it doesn't come through, and what does you can't hear. The new Boss PSA is also a digital switcher, as are most newer supplies, but the Boss only supplies 500mA while the OneSpot supplies 1700mA, so for roughly the same price I'd definitely go with the OneSpot. I've been using one for years with no issues.
The old style Boss Power Supplies, and many of the other cheaper/older ones had a small transformer in them to step down the line AC voltage ~10X, then used a couple of diodes to rectify it to DC. They had a cap across the output of the diodes to filter out the AC ripple, but they didn't do a great job so there was some hum associated with them.
For a truly isolated power brick, you have to look for one that plugs straight into the wall, usually with an IEC power cord like your computer uses. There are lots of cheap power bricks with "isolated" outputs on amazon, ebay, etc..., but all of the cheap ones I've seen use a wall wart to power the brick. If it uses a wall wart to power the brick, the outputs aren't truly isolated, they have a shared ground, so they aren't going to be any better than just using a OneSpot and a daisy chain.
Hope this helps...