I would suggest Argentina if you liked the hot girls in Punta since that is where they are probably from. Punta del Este becomes an extension of Buenos Aires during the christmas break (DEC-MAR). It is THE vacation spot for the middle upper and upper class of Buenos Aires. I've been there in the off season too. Not that interesting and kind of cold.
Not to say Uruguayas are not good looking, but the ratio of hot/non hot girls really goes down when the break ends. Clouds come in, it gets cold, and it rains until they come back the following season.
rcl