Matchbox Pyramid boxes are reasonably light well certainly no where as heavy as the Milos, being modular you can add the odd tray if the basic box does not give you enough room, there is also one of their cheaper range of boxes that comes with square legs. Have a look here for the Matcbox range
http://www.talkangling.co.uk/matchbox.htm
Plattforms also do a great box that is not as heavy as the Milos but may be a touch heavier than the Matchbox