I have just tried new version of framework (asp.net mvc 2 preview 2) that includes server and client validation with jQuery integrated, looks fine.
it has attributes for properties in my model (entity) like DataType. where i expand to see which options i have so it has all what u want u dont, like Duration and PhoneNumber :)
but i dont have simple DataType like Number!
regEx does not a good idea for it, cuz i want to user built-in option of jQuery validator for number