The dhb Goldline were well reviewed by road.cc recently, though Wiggle are currently out of stock.
I’ve got the dhb Aeron Pro which seem to strike a good balance between comfort/performance and price. The pad isn’t as comfy as the one in my Assos FI.Mille shorts, but they were about 40% of the cost. I use the Aeron Pro’s for commuting and short-ish rides (sub-2h) and the Assos for longer.
Don’t forget that Castelli are cut for the pro cyclist physique…people often say ‘go a size up’ but in my experience they just get longer but no wider…great if you’re built like a beanpole! dhb and the like tend to be a little more forgiving.