I also agree with the first two posters about the speakers making a much bigger diff. than the electronics you'd use to compare them as long as you don't use low end junk (which I'm sure you wouldn't).
For example, take the same say -high end Denon Rec., and plug in the three diff. speakers you mentioned and the sound change will be much greater than if you picked just one of those speakers and connected them to a high end Denon, Onkyo, or Rotel Rec.
As for speakers... instead of overpriced store speakers (though B&W at least are great speakers), look at some of the great online speaker deals.
Diva's are much more for the money than Klipsh for sure.
nohr.com
Those are awesome speakers using the best drivers, and have the best cabinets (marble!) this side of the new solid aluminum (and new car priced) Krell models.
Look up
www.newformresearch.com for my personal choice as 'best sound/ best value' speaker out there though.
I have two pair (no center chan. needed with this line source design -which can add to the money savings and/or amp power), and they're AWESOME.
Very, very close to Matin Logan's effortless sound except Newform mates it's ribbon unit to one of the best bass drivers in the world (from Scan-Speak), and they don't have M-L's huge brick and motar price tag (that's part of why you're at Outlaw right?) and you don't have to plug 'em in like M-L's, and the 645 model is even 91db eff.
They don't look as cool as M-L's (though most speakers don't), but they don't get in the way either, since above they're 30" high bass cabinet the steel cased ribbon is only 3" wide for a micro-monitor 'invisible' sound.
They also have some cosmetic seconds sometimes that're 10-20% off the already screamin' deal price. Both of my sets are 2nds (still come w/ 5 yr. warr.), and one speaker has a tiny scratch on the back of it. That's it!
The ribbon is fairly harsh in the first few days, but after 2 weeks, it's not harsh at all, just very clean, clear, and resloving (meaning it'll pick up harsh solid state garbage if that's what you give it).
The bass drivers need lots of time to break in, so don't worry if the bass and treble don't blend seamlessly right of the bat, give it a few months, and then they'll become 100% seamless.