Lets assume worst case scenario when the cam belt snapped,witch one would be expensive between repairs and a new motor..?

Cost about the same, your going to have to replace the heads on the engine and most likely replace the piston that the valves were being hit by.
This would be a total engine tear down to repair, there are shops that say no and just run the damaged pistons which will work. But it's just a meter of time before a connecting rod or pin fail causing another engine tear down.
More economical to replace the whole engine with new internal parts. Thank you for using fixya and good luck, you can also upgrade your engine by using timing gears instead of the belt. But it will be loader, since you'll hear the gears whining.

Happend to me once
not nice