I think that would provide some nice variety and make wearing full sets worthwhile.
For paladin, full allagan comes with SOS wall, which lasts 1 minute and negates 5% of damage when HP is below 20%.
For warrior, full allagan comes with life fabric, which grants a 1% chance an auto attack will return the damage dealt in HP.
For WhM, Sacred Light which has a 5% chance of cutting a CD in half.
Etc, any others agree?