I think it's source-related mainly. I've found power conditioning to provide little to no gains for an unreasonably high cost if your local area is new and power is clean to begin with. It's a different matter if you live in an old building or are running multiple appliances or major electronics in the same room.
Source and amp is where I'd focus my energy. If you can hear cable differences, then your hearing's not the issue. If you're using a computer, the transport (USB to SPDIF converter) is just as important as the DAC, unless you buy one of the more expensive USB DACs which have decent built-in conversion. For the amp, that really depends on your preferences. But, if I were you, I'd find myself an M^3 or GS-1/Dynalo if you want high-end value. With a larger budget, you could choose from a number of amps that would sound good with the 800s.