Sami, welcome. I suspect that soon you're going to have both good news and bad news. The good news will be that the Axioms sound great; the bad news will be that it means that your 500(100 watts/channel)is plenty for them if it's still in good operating condition. It's unlikely that you'd need a new receiver on the basis of power capabilities, but replacement to get more up-to-date features may be another matter. Enjoy.
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Enjoy the music, not the equipment.