I'd say 'Good for you, then' and 'Too bad for you'.

"So much the better for you."

Even more casual, "Tant pis pour toi", in the US, can be said as "Sucks for you". I wouldn't use it in formal situations, but among friends it is pretty normal.

"Tant mieux pour toi !" = "Good for you (, then)." "Tant pis pour toi !" = "Too bad (for you)!" That which is placed in the brackets may or may not be said depending on the context of the conversation.