In the case of "power", the question about how much should be replaced with how good of watts can you get for your budget. There are powerful amplifiers that have nothing musical about them. So, power alone would be a poor guide. Try to get electronics that have equal quality and sophistication to the 805s. I like Tube SET amps that use the KT88 tube. Some push pull models as well. There are also very nice solid state equipment (like the ones suggested so far) For cabling, Nordost is superb. Especially the Red Dawn series & up. Also, Purist Audio would be choice. For AC power centers, consider Tara Labs, Shunyata or Richard Gray. Hopefully your source components will be the very best that you can justify.