The Adam 64 denier opaque tights for men from Czech manufacturer ELA are an excellent budget opaque; not to be confused with their Collanto namesake (which are cotton), they are very similar to the Aries Micro Goldwear 60 and Collanto Aurel 70 opaques. They have a conventional reinforced 'boxer' style brief section and toes, and a male centre panel (similar to that of the Evona Fred opaques) but with the benefit of flat seams. They are very comfortable, and appear to be extremely durable too.
An impressive product, especially at this price!
ELA Adam 64 Men's Opaque Tights