In the original X-series the gem sonicly is the X-600s. Not just more power but a significant improvement in all factors such as details,timbres,soundstage,etc. However, you might want to try either a new X-350.5 or when it comes out shortly,a pair of X600.5 monoblocks because the new X.5s are a significant shift towards sonic bliss! The X-350.5 is great and you could get one at the price or near the price of a used pair of X-600s,which I think don't sound as good as the new X-350.5. Hope this helps.
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