if you have floor standings why dont you buy some dipole rears from yamaha or bipole even
dipole are the best.
but satalites **** unless they are bose and they aint cheap
you can get dipoles here by DB DYNAMICS which are great for about 250 a pair go for the polaris sereis 2 or 3 dipole rear bookshelf/wallmaount speakers by db dynamics my opinion
but you can get them in yamaha aswell or are you goin with sats because of room