I had a Boston Acoustics set up before with 4 VS240s as surrounds. I now have 4 SR8080s. The 240s worked great and were better at pinpointing sounds. My problem is I am picky and the books shelf speakers firing straight ahead in a 21 foot room were bouncing to much. I dampened it with acoustic foam but eventually went bi polar in the rear. You may want to try 4, 8040s. I will tell you though, my room was 12.5x21 and I had sound bouncing everywhere. You may need to look into some sound control at some point. I just think the 1000s are a better woofer the 3.5 inch woofer in the 8040 aren't close to the same size as the 1000s. There are trade offs no matter what you do, you just need to decide. You might just look for some used BP1.2Xs to go with the 1000s up front or trade the 1000s for some SM350s that can be found dirt cheap. There are so many options for you. If you want to make the wife happy with cost I would do the SM350s with a 2002 center and the 1.2Xs. You will get great sound and it should be less money. The upgrade bug never stops though so be careful.
I just checked, New Egg has the SM350s for $250 a pair, free shipping. Unless your space limits you I would put them above the 1000s.
Chet at Def Tech suggested going with 4 SR8040BP's as surrounds and rears as his first choice, 2 SR8040BPs as surrounds with 2 PM 1000's as rears as his second choice, then 4 PM 1000's as surrounds and rear as his third choice. I am leaning towards the 4 8040BP's and am now entertaining doing 3 PC2000's across the front as L/C/R in lieu of 2 PM 1000's and a PC 2000. I am wall mounting all my speakers so cabinet space is not a problem. I just need to figure out how to vertically mount the Pro 2000. There have been a few people on the 600/800/1000 thread that have done just that and stated they loved it.
The upgrade bug is BAD right now....the nice thing is I have not bought a single thing yet. I started with PM 800's all the way around and now......well, you know...
Sounds like a good plan. I would also look at the new SM45s for fronts. I don't know if they can be wall mounted though. I have the SM65s in front and run them as a phantom center. I prefer that sound to a CC. I even tried moving by BP2006s in the room and used one SM65 as a center but just don't like it. The SM65s image so well it sounds more like a wall of sound and you can't pinpoint the center, but it pans excellently.