The heaviest part of most amps is the transformer the size and weight of these can tell you a lot about the capable power, but in more traditional amp there are other components that contribute. With the advent and maturity of class d you don't need a heavy amp to get high power anymore. Judging a receiver by weight is not the most reliable method. Instead pick brands that are reputable. Adding useless weight isn't hard to do so don't make it an important spec.
Fronts:Madisound RB Kits Rears and Sides: Kef 2001.2, Subwoofer: TC Tiger-1000
Receiver:Onkyo NR-708 Amp: Behringer EP4000 Players: Panasonic BDP-60, Onkyo DX-C390 Projector: Epson 8350 Screen: FAVI PD-HD-92
That's like trying to get decent sound in a public lavatory.-TLS Guy
Heck, if you've got the cash, go the NSA supercomputer route and use Fluorinert- Adam
A shovel of dirt can stop a flood. -Westom