you won't get a 1st and 2nd rounder. maybe a 1st and 3rd rounder if the guy had the last pick of the 1st round (12th and 36th pick), but even that is unlikely.
if i was giving pujols, i'd give up on getting a 1st rounder at all, and try to get a 2nd and 3rd rounder. i think that's the most feasible, and would be a good deal for you. something like tejada and andruw jones lets say.
otherwise, just keep pujols.
this is all assuming it's a 12 team league or deeper. if it's anything less, just keep pujols.