I think a good combo would be a summon-necromancer (20 skeleton, 20 mastery, 1 into all curses) and a hammer-paladin (20 hammer, 20 conc, 20 vigor, 20 blessed aim) would be a great combo.
Hammerdins can solo the game well, but an untwinked one will appreciate all the minions to hide behind. No curses really buff up hammerdin damage - so feel free to use a safety curse like decrepify or dim vision as your main curse (if you choose dim vision, it's worth maxing on an untwinked-straight-to-guardian romp). Other good necromancer skills are CE, bonewall (for armor synergy) and skeleton magi (they don't get as much respect as the melee ones but untwinked they can be worth it).
You can improve your team boss-killing abilities by getting a crushing blow weapon for the paladins switch. If it has decent base damage (elite class weapon) you can probably tank any act boss with lifetap (the necro can constantly renew it) A black-runeword scourge would work perfectly.
Here's some good basic gear to shoot when you're untwinked:
Both: Gambled boots with resists, Gambled/Crafted caster belts with resists/life, gambled rings with resists / mana, Lore circlets or Ral-Ort-Thul masks, gambled gloves, Stealth armor
Hammerdin: Spirit Sword, Spirit all-resist Paladin Shield
Necromancer: Spirit Sword/White Wand/Shopped Wand, Rhymed Necro-Head or Necro-Head stuffed with Pdiamonds w/ good skill mods.
Mercs: At least one should have an insight pole - this is a huge boost to your team. I'd do might + prayer for their auras (give insight to prayer merc for best effect).
In general, give the paladin the better gear. He's the damage dealer and is closer to the enemy.
The only catch - you will HATE the maggot lair. Crawl through it with lifetap, smite, hammers when you can, golems and corpse-explode. Ditch the skeletons for here, run salvation if you need it for maxed resists.
If you're new to 1.10, respect fire enchanted monsters (FE/extra strong is the new MSLE). They will 1-hit you in NM for sure. They can womp you in hell too, but they are somewhat less dangerous because their explosion damage is deliberately nerfed in hell difficulty. It doesn't effect mercs, so let them get the killing blows. Do not try to smite them, for sure.
