It's not bad to be thinking about idle sets, but don't forget about other useful pieces of gear:
Pieces with refresh, such as Marduk's Jubbah or Dalmatica, usually generate more MP over time when not getting hit than you save in cures if you were wearing -PDT when actually getting hit. You can use the saved MP to cure yourself - or others.
Pieces with -MDT or MDB, such as Avalon Breastplate or Dalmatica, also reduce magic damage in the event that your attacking mobs that use frequent magical attacks.
Pieces with -Enmity, -Enmity when taking dmg, +Movement Speed, etc, are also bonus pieces that can reduce the chances of taking hate (or additional hits when you do take hate).
If you know your going down, you can also have an 'oh sh*t!' macro to equip things like reraise hairpins, so you can use them as soon as you raise back up.
Edited, Aug 23rd 2010 1:43pm by Asmoranomar
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Asmoranomar - Diabolos
BRD/RDM - Song Cast Time Setup
BRD/WHM - Wind Buff Setup
BRD/WHM - Wind Debuff Setup
BRD/WHM - String Buff Setup
BRD/WHM - String Debuff Setup