See my earlier post - number 369 in this thread - for an opinion on Spiegelau as an alternative to Zalto.
(Love my Zalto collection, though.

)
Glasses from both sets go into the dishwasher daily. All still going strong. Have not had one break in the dishwasher ever (on Delicate, and only glasses in that drawer).
A careless guest did demolish a Zalto recently - but he didn't seem bothered by that!
There are some bargains around on the Spiegelau Definition. Just google for options. Price will depend on the style you prefer.