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I haven't heard of an Intes MK503 before, the specs I found online are the same as the Intes-Micro Alter M500. Personally, I would shoot for 6" or larger, unless low weight is of great importance.
The Santel MK6 seems to be today's incarnation of the erstwhile Intes MK67 (which I've got), the two look identical and have the same specs. It has a fixed primary mirror and Crayford focuser, and a separate secondary mirror in a cell that allows for collimation (Rumak design). Not many of the Russian Maks combine these two features, which are important to me. I haven't seen any Santel scopes in the flesh, but the company is run by ex-Intes people. If their scopes are anything like the old Intes ones I'd say you can't go wrong with the MK6.
The modern C6 is a capable scope, but feels like a toy in comparison with those Russian Maks (and weighs only half as much).
Cheers
Steffen.
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