If you *really* need mana, try finding or gambling for Bahumut Rings and amulets. They can go up to something around 120 mana each, and are damn useful. Get A blackbogs, get a Lidless, get a Peasent Crown, get a Vipermagi, get a pair of frosties, get an elitch (very cheap +1), get 2 mana rings, and slap on silkweaves for your level. You'll have a total of (+4 +1 +1 +1 +1) +8, which won't be alot considering you won't do much damage in the first place, but you can actually move the bar on monsters this time!
I SUGGEST you get a Defiance Mercenary. My merc in hell has like 8k Def, gets me up to about 6.7k and just rapes. He will also help your golem and skellies survive a *little* longer in hell.
E1: Wait...you said about 6 in CE. Don't you mean PE?
E2: You are not a killer. Just get a point into Lower Resist, and help the party out with LR / Amp + CE. You won't be doing much damage for PvM until you have much much better gear.
For Example:
My nec has this stuff, and can kill *not too fast, but moderately* in an 8 player hell baal game. Takes him about 15+ Novas with LR to kill the minions when no one is helping.
Helm: 4/3 Facet Shako (waiting for a 5/5)
Shield: Um Homonculus (waiting for a 5/5)
Armor: Enigma Mage Plate
Gloves: Trangs
Belt: Arachnid
Boots: Marrows
Ring 1: SoJ
Ring 2: Raven (waiting for a SoJ)
Amulet: +2 / 18 Lit Res Rare (Waiting for Maras or a 20% FCR / 2 PB Skills crafted)
Weapon: 5/5 Facet 2/50/7/7 (perfect as far as I'm concerned) Death's Web.
Merc Gear:
Weapon: AmnHel Bonehew (only thing I have right now)
Armor: Lionheart Diamond Mail (waiting for a shaft)
Helm: 8/7/16 Gaze (waiting for a better one)
Stats:
1 Skelly Mages
1 Golem Mastery (1 more level for Summoned Resists then i'm done in this tree)
1 Clay Golem
1 Lower Resist
1 Bone Spirit
20 Bone Wall
20 PG/PE/PN
+2 P/B from inventory.
Total Nova Damage: ~6800. Not much, but with over -100 poison resist, it can do ALOT of damage.