Hi Dean, thank you!! I'll move all my speakers to accommodate wides, I haven't had that great a result with back surrounds, I've had them for years and I haven't found their effect that engaging, sometimes they even distract me from the action in front. What I'll try is get 2 stands fro the front speakers and put one exactly on each side of the TV, move the rack a little to the right to make that space and leave the TV centered, and as you say put the wides pointing at the main sofa where the front of each side couch is, and even move the side surrounds a little to the back, well as far as the door allows, and after getting the new sub configure everything, run Audyssey and test that for a while, I can always move things around again!

About the subs, I've hear great things about HSU all around and they´re the only ones that have a distributor in Mexico, it's not in Mexico City it's about 2.4 hrs away but it's probably better, I'm going to check it out...
Thanks for all the help!; I'll be posting back progress and all...