This won't be suitable to everyone's pallet (especially a priest), but I'm currently running with this as my lazy auto purge/interrupt mash macro (mainly for av).

Optional starter:
/castsequence Wind Shear
/cast Purge

Main course:
/castsequence Flame Shock, Lava Burst, Winds Shear, Wind Shear
/castsequence Lightning Bolt, Lightning Bolt, Chain Lightning
/castsequence Purge

Season to taste with target, reset, click etc. However, for dps this is more korma than vindaloo. If you prefer to tenderise the meat before cooking, just rotate flame/lava right one or two places:

/castsequence Wind Shear, Flame Shock, Lava Burst, Wind Shear
/etc