.....SVS has been a good choice so far for me concerning quality subs, but here's something you 5.1 owners could do....
.....work toward the mains you wanted to buy but didn't, and a used slave amp....when the new mains and slave-amp show, put the new mains in place, and take their signal from the pre-outs to their slave-amp....hello headroom.....leave the old fronts hooked up at the receiver output posts as fronts, but move them to rears positions....move what you had for rears to mids....with a kicker 5.1 receiver, which is all the channels SACD sends anywho, you'd probably have a better sounding mousetrap than other regular legitimate 7.1 systems.....the rears, pushed as fronts, would be strong, with the new mains/fronts being kicked by 2-3 times the watts by the slave-amp to dominate the rears, and the mids would continue on as accents, a desired distance to the sides....does a 5.1 receiver cost less?....does a cow have a butt?....I quit....yawn....