I think the answer to your first question is probably yes, at least as far as the integrated goes, as I've heard a Mac-Sophia combination and it works pretty well. The Sophia is more forgiving than other Wilson speakers of the electronics it is fed, it can actually sound good with a good receiver powering it. As far as the Lector goes, I can't address that, but hopefully someone reading your post has tried that combination. You might want to bring the player over to the dealer's to hear it in his place, if you can't get the dealer to bring the speakers to you for a home audition (which he may very well do if it's a good dealer and you indicate that if you like it you'll buy it on the spot). I agree with Larryi that it's not a waste to get good speakers, and my bet is that the Wilsons will sound good even nearfield; you should go back to your dealer to see if they pass the low listening level he describes.
As far as buying demos goes, as long as it's an authorized dealer and they haven't blown the drivers, that's a good way to go; I've bought demo speakers in the past from a dealer I trust with no problems.
As far as buying demos goes, as long as it's an authorized dealer and they haven't blown the drivers, that's a good way to go; I've bought demo speakers in the past from a dealer I trust with no problems.