I had the same thought when I had the QED cables for a while; I did eek out a bit more, for not much money. The Tellurium are nice sounding cables (I've only tried the Blue and Ultra Blue II, the Black starts creeping in to a different price bracket altogether)
There's usually second hand Tellurium speaker cables on ebay, definitely worth a punt. Its what I usually do for cables, rather than pay full whack, and sell the item on if I don't like it or get the urge to try something new. For me personally, when I had the Blue II, they were a tad too smooth for me, but, I did find I'd I stopped analysing my system, and being absorbed in the music, and I think so far, the Ultra Blues seem to be similar without the excessive (for me) smoothness. They still retain all the detail I could want but without pushing it at me 😊