Sekka +2 (+9 Agi, +20 Evasion)
354 base skill
+70 Evasion
+20 Agi
+10 Evasion Skill
I know this is a set for Ninja... but I've tanked a few "bigger" things with it and can I think explain how it fares.
For abyssea these things are fairly easy
T2 VNM (RR/Mounted Champion/AoA) : Tank in full DPS gear
T3 VNM (RR/Cloak & Dagger/AoA) : Attowha Chasm is easily solo-able
Hydra / Cerberus
Heros T1 ToAU NM's (RR/Cloak & Dagger/AoA) : Evasion rate not capped with full DPS gear, but the above set is a bit much.
Heros T2 ToAU NM's (RR/Cloak & Dagger/AoA) : Full evasion set gets me near evasion cap, but I'd need to improve a bit to hit it solidly
Visions NM : tank in full DPS
Visions Zone boss : use a mix of DPS/Evasion
Scars NM : tank in mixed DPS/evasion
Scars Zone Boss : Tank in full DPS with support or full evasion otherwise
Heros NM : Tank in mixed DPS/evasion
Heros Zone Boss : Tank in Evasion gear
TL;DR... the above set isn't enough to hit max evasion on everything I have wanted to tank on Ninja. It's close though.