If you are going in March you need to make your reservations pronto, if not sooner. As far as which resort, I would recommend All-Star Movies, but the others are just fine. Having stayed at the All-Stars many times I say the bus service to the parks is the best. Since you are going at one of the busiest times of the year, if not the busiest, expect long lines in the parks, especially the MK. Have a grrreat time and good luck getting into the resort of your choice, but remember to be flexible and tell the CM that, as he or she may have to split your stay between resorts if you are planning more than a few days at WDW. Don't try to do it all in 2-3 days. I know a lot of persons who were overwhelmed during their first trip and won't go back.
Lord High Keeper of the Knowledge of Right and Wrong, Counselor in Moments of Temptation, and Guide along the Straight and Narrow Path and Oldest Active DWT/WDW Radio Member
DL: 1955* (1) WDW: 1977* (2), 1980* (2), 1985* (3), 1989* (3), 1996 (ASMu-3), 1999 (ASMo-3), 2000 (ASMu-2/PO-2), 2001 (ASMu-5), 2002 (ASMu-5), 2003 (ASMo-5), 2004* (8), 2004 (ASMo-8), 2005 (PC-10), 2006* (15), 2007* (20), 2008* (22), 2009* (26) 2010* (27) 2011* (32) 2012* (39) 2013* (36) 2013* (15) Total Days @ Parks = 294