Well we are lovers of hifi and not electronic engineers and can advise on what will help work for you,some on the forum are very well versed on how the electronics work in amps,speakers etc,but on the whole you seemed more concerned about power and watts as opposed to actual sound quality,just because an amp has impressive wattage figures doesn't actually mean that it's any good,yes it might go loud,(SO DO THEY ALL).but that doesn't mean it can hold it together when you start to crank it up as you say.Also when you start to go up the food chain so to speak,amplifiers from the likes of arcam,roksan,Creek,naim and cyrus to name but a few will reveal more of the music,detail retrieval,refinement and excellent dynamics will all come to the fore.thats why they're expensive and then further up still you have the amps with the big watts to back up the detail and refinement and these are the ones for driving difficult speakers such as atc,pmc and some higher end focals,low sensitivity speakers =more watts needed from the amp to keep them under control . think of 85db and lower as a difficult to drive speaker and 88-92 as a nice easy load on a amp.But there is some exceptions to this rule for example my own pmc twenty 21's on paper look like an easy speaker to drive but they crave an amp with a hefty power supply and I don't ask questions why this is,it just is.so my rule of thumb is to keep everything in balance ie speakers,amp in the same kind of price bracket,a good source is important also but not as critical as amp and speaker matching.hope I've helped a bit.