I prefer the sets and boards from the House of Staunton here in the USA, although I'm not familiar with equipment offered outside the USA. (Note - HOS gets their cheaper boards from Spain, and as far as I know, the sets are made in India. But the sets are really nice.)
Concerning sizing, here's the two guidelines that I'm familiar with. Sorry, some of the dimensions are in inches. Also, remember that some of the guidance is geared towards the USCF; There might be minor differences between sizing guidelines for the USCF versus other chess organizations, but I think the general ratio between pieces and squares should be the same.
http://www.houseofstaunton.com/faq.html (See FAQ question #1)