If you have a realistic shot at the title, take it. Rasmus could turn into a superstar, but he could also turn into, say, Nick Markakis, and the projected difference between Morales and Fielder is not huge in future years. Remember, Morales is younger, and hits for a high average, but probably will never have Fielder's power.
If this can take you to a title, go for it.
Help with mine:viewtopic.php?t=416428