It dont gives more MR than FoN.
It dont gives more MR aura than Aegis.
If you want to something new:
Negatron Cloak + Giant Blelt + 700gp
Effect: 500HP, 50MR
Unique Passive: You take 10% less dmg from abilities. (works also on physical/true)
Unique Passive: If you are object of enemy spell you hit him back for 100 magic dmg (50% if spell is aoe). (cld 30sec)
However my personal dream is:
QSS + Negatron CLoak + fee
Unique Passive: 35% tenacity
Unique Active: Get free from CC now.