I have no problem with Pacquiao fighting Hatton but i wouldn't like him moving up and moving down straight away in weight, sure its not a lot of weight but it can still effect you. So Pacquiao has to be careful im not sure how i want him to finish off his career but i would say these 3 fights.

Manny Pacquiao vs Ricky Hatton
Manny Pacquiao vs Edwin Valero beginning of 2009
Manny Pacquiao vs JMM vs Casamayor winner mid 2009

And if Pacquiao has one fight left after that then i would like him to fight Guzman.