From memory, the Rw12 definitely has more output and punch compare to the SW310 due to a bigger woofer and encloser. The SW310 works better for me as my sub needs to be in behind my TV which sits in a rectangular hole in my house. The RW12 does not fit in this area (I thought it would). As i mentioned earlier, If size does not matter, Rw12 would be my take over the Sw310 (best sub for $299 right now IMO). Don't know how Klipsch lists the SW310 higher/more expensive than the rw12. Perhaps, The Sw310 seems to have a better finish with three 10" drivers and a better finish. My HSU vtf2.3 is definitely better than the rw12 (deeper, louder, and cleaner) but not twice as good consider it costs around $600.
I definity got a much much better deal than hce considering the Denon 2312 alone is going for $700 or more. Best of all, I sold the Energy Micro that I got from this $999 bundle for $200, so at the end I paid $799 for Denon 2312, Klipsch Sw310, samsung bluray player. Consider this as a bargain of the decade
. To me, $799 for the Sw311 is a ripped off (no offense here) as one can get a much much better sub from Hsu, svs, Epik,Outlaw, etc... for that price.
Regarding the Denon Amp power, Hometheater just reviewed the Denon 1612 and said 'Denon's rating of 75W/channel is actually quite conservative'. It was measured at 71W/ channel with 5ch driven.