I think the price is dictated from the amount of tubes that are rejected in order to have the desired spec, and to lesser degree based on materials used.
Certainly not comparable to the cable makers absurd way of pricing.
In your case the criterion would be simply what kind of sound you want from your Elekit.
If it is precision and solid state type of presentation, you should go for Acme/Summit
If you want a more "romantic" sound go for Horizon/Legend series (which in my opinion would suite your amp the best)


