MAS,I haven't heard this particular model from the Selah Audio line. I have spent time with earlier Seas Excel woofers/Fountek ribbon tweeters line arrays from Rick Craig and have been very impressed. The Excel drivers are special and well known for their very low distortion and should really shine in these arrays. At the Rocky Mountain Audio show in October he had the XT8 (Vifa XT woofers) and Fountek ribbons arrays for listening and I enjoyed hearing them.
As the sensitivity of these arrays in the low to mid 90's, your amp has more than enough juice to make them sing. That performance coupled with the current 15% off line array sale should be enough to seal the deal.
Jim
Jim