On a pound for pound basis there are two makes i would look at firstly theres the range from Plattforms which have no plastic bits to break and are solidly engineered try
Fosters of Birmingham - the complete fishing tackle specialists for details, the series 5 box is on Ebay at around £290. Secondly have a look at the Matchbox Pyramid boxes which can be more or less custom built with its modular design and added to at a later date, again no real plastic bits to break. Login to
www.talkangling.co.uk the full range can be found there.