Ah ok thanks Tony. That's helpful. As for being "better", I try not to use terms like that. For me different pieces of gear can all be appealing even with different presentations. I wouldn't want the LS3's to be identical sounding to the 149's, and that you indicate that they're different is very much a positive. I have my 149's on top of a pair of Allison One speakers at this time, very close to the front wall(The Allison's required placement is against, or as close to the wall as possible). It certainly wouldn't be difficult to put the LS3's out in the room. They'll take a lot less space then most of my collection of speakers do currently.
Yes I realize that buying new( or at least something used that is not old) is probably the safest thing I can do. And I am leaning towards the Falcons. They're $2600 USD, shipping included. The only issue for me is that they have to cross the country to get here, which means that they will be at the mercy of the rough handling of the shipping service. If they were local at that price I'd already own them.