OP
I have owned Kef speakers and have not heard Tekton. so, I cannot pass judgement between the 2, I used to own the KEF meta, and I moved on to other brands. all I can say is Kef is good speaker, cannot go wrong with it
in your case, please check out the Kliphs line of speakers., especially the Floor standing models. Horns are sensitive and will get the best out of the R8. and yes, i do own Tubes. you can listen for the lower end models at best buy, but it will give you an idea for horns. if that pleases you, then see if can find a suitable dealer who carried their Heritage line. I say this because your music type, power amp and room size all seems to fall in line with Horn type speaker. i have their bookshelf models and when paired with my tube amp, and play some Rock and roll, they do shine!!
Good luck

