Jeez.. Is it ever going to stop with the watts. Won't be long and they'll be claiming more total watts than you can even get out of a 110V-20A circuit.
Forget about the watts. The only people who should be concerned with or impressed by enormous wattage ratings are sound reinforcement teks and SPL drag contenders. The rest of the world listens at less than a watt per channel most of the time, and perhaps a few watts into a sub.
So, I'm going to pick on you for a moment as a teachable moment to others. Did your decision to go with that particular system have anything to do with the wattage rating compared to alternative options? The fact that the only information you chose to share initially about the system to others is the watts per channel, suggests that the wattage rating was an important factor in your purchasing decision.
As it turns out, for home stereo and home theater, wattage "ratings" are one of the least, if not, the least important characteristic of the system. Unfortunately, budget audio gear, with no specifications that would sound very good on paper when stacked against alternatives, has resorted to clouding the market with the misleading premise that wattage does matter, and have managed to perpetuate that lie into the masses of consumers by highlighting wattage ratings as the leading indicator of system performance.
The more important question about wattage ratings on your gear should be: How many CLEAN watts? AND- how clean is "clean?"
Many people will tell you that the best upgrade path for the system would be a better set of speakers. In my experience, it is the amplifier quality that is more important. It is counter intuitive because the amplifier is not the component that you actually get the "sound" out of, so the mind tells us, that the sound quality is dependent primarily on the speakers. In truth, even simple cheap speakers are generally capable of playing most of the listening range with reasonable enough accuracy. It's the amplification quality (not rated "quantity") that really brings out the "best" in those speakers.