Power Cables

I am currently upgrading my system.  I had a pair of XLO Ultra speaker cables sitting around and was very impressed with the improvement over the original Monster cable.  Having come back from Axpona, I am wondering what fellow Audiogon members would recommend for a power cable with tight bass, superb mids and extended highs that would help to produce a very full, wide and deep soundstage.  I am looking to replace the cable on my Adcom GFA-5802.  I do agree with philosophy of starting with the power.  I have demoed one other power cable and the difference is immense.  Thanks in advance for the advice.