Is it practical to use non-SAM Genelecs (i.e. the 80XX series), as surrounds? If so, the OP could find an older pair of Genelecs (maybe even the 8020's for < $500), see how they hold up as his mains, and if they don't, he can relegate them to side or rear surrounds (where they'd be pretty kick-ass!).
The only thing is, I don't know if it's possible to remote control their volume, or manage their volume through the AVR. Anyone here have any insights into this?