Grid is way better than any other RaidFrames, no need for decursive then aswell, just get GridAlert and let it make DING! when somebody has a debuff you can cure and in combination with a Clickcast addon you cure as fast as with Decursive. For classes with 2 cleanse spells you simply let Grid show the background in different color(Magic=Blue and Disease=green) orso to know what they have.
XRaidStatus isnt really needed for any class besides Pullers and the RaidLeader tbh... It just has statistics about your raid that drag away your attention from the screen if you arent in need of this Information.
What i would suggest for Druid/Priest/Mage is to get CorkFu. Makes buffing alot easier and saves alot of stupid questions for buffs.