If the OP hasn't been clipping and is happy with the sound I'd say he doesn't need a new receiver.
And it's probably not clipping if it lasted 10 years. I'd guess that some of that luck is because the sub has been doing the heavy lifting; but part of it might be that the common (mass-market) manufacturers used to over-design, but now I think they come right up to the spec line.
With that in mind scgm, if you do wind up getting a receiver I'd look for one rated at 4 ohm (if doesn't seem like your current receiver is). It worked out the last time, but you may not be as lucky the next time.
