I doubt Liverpool could afford Joaquin, and even if they did,he won't be able to help them in Europe,they'd be better off spending their money on less costly targets.
Have to admit they're on a very impressive run right now, rock solid defensively and finally found scoring which was a problem at the start of the season. However, they are yet to play Arsenal(twice), Chelsea(away),United(away),Bolton(twice),Tottenham(home),Newcastle(twice) and last but not least, Everton(twice).
They had a pretty easy run of opponents lately(Boro and City were the top of the bunch), and while they did very well, i'm yet to see them beat a top quality team in the league this season.
Kudos to Benitez,he seems to have adjusted to the PL style unlike last season, which was a learning process for him.