I'm surprised more people don't use the resistance flask- it has decent hp, some badly needed offensive stats and enough resistance to let you use a normal item elsewhere.
FR pieces:
[Amulet of the Torn-heart]
[Wyrmcultist's Cloak] + 15 FR enchant
[Inferno Hardened Chestguard] +15 Resilience enchant
[Inferno Hardened Gloves] +8 fire patch
[Blastguard Belt]+2 solid stars
[Blastguard Boots]+2 solid stars, 12 sta enchant
[Phoenix-fire Band]
[Flask of Chromatic Wonder]
Other pieces:
[Nordrassil Headdress] (Hit/ AP enchant)
[Nordrassil Feral-Mantle] (Scryer Enchant)
[Veteran's Dragonhide Bracers] (Solid star, +12 sta enchant)
[Pillar of Ferocity]
[Thunderheart Leggings]
[Band of the Abyssal Lord]
[Brooch of the Immortal King]
[Timelapse Shard]
296 FR, crit immunity no sockets wasted with void spheres, a decent amount of hit and ~16300 hp unbuffed (No endurance of course). This gets over 23k if I have an imp and non- improved commanding.
I get to use my best piece- t6 legs and have a slight buffer whereby at full hp I can take a beam and a 75% resisted melee hit and live dependant on healing.