Nordost can get very expensive in those lengths. I think their red dawn cable is quite good. A big advantage of nordost cables in general is that they don't seem to suck power like some cables. I find I use less gain with nordost verses other cables. A consideration since you are using a medium sized amplifier.
You might want to give analysis plus oval 9 cables a try. They are only 'somewhat' flat - maybe 3mm x 10mm. Very smooth sounding. Sumiko OCOS cables can sound very good in some systems too - very quick medium high detail level. Their advantage is that long lengths are relatively inexpensive. Another very good cable is the LAT. You can give the guys at www.echohifi.com a call. Very reasonably priced for the performance.
You might want to give analysis plus oval 9 cables a try. They are only 'somewhat' flat - maybe 3mm x 10mm. Very smooth sounding. Sumiko OCOS cables can sound very good in some systems too - very quick medium high detail level. Their advantage is that long lengths are relatively inexpensive. Another very good cable is the LAT. You can give the guys at www.echohifi.com a call. Very reasonably priced for the performance.