Monk + necro is an amazing combo, even at higher levels.. monk dmg avoidance + necro heal pact line is actually pretty effective at tanking mobs straight up even into the mid 50s.
All your original choices are solid, and i also agree with a bard as a great thought as well.
I'd advise against cleric in a duo with a necro, though.. They offer little in the way of dps... Healing a tanking necro pet means stuff is dying very,very slowly.... Even casting fear in a fear kite so the necro doesnt have to is kinda blah as well.. Fear is cheap to cast.. classes like druids and rangers and such who can cheaply snare + do dps/dots .. compliment necro style kills far better.. And darkness spells are far more annoying mana wise (and resist-wise) to a necro than chaining fear spells.
That, of course, is only really pertinent if you insist on the duoing aspect for your whole eq career on p99.. A cleric still offers heals, hp buffs, fear spells, lull spells vs. live mobs, and stuns (for healer/caster mobs in dungeons/places they can't be readily feared).. Which makes them a bearable duo partner at off-peak times. And if you want to add people to your group... heck.. CLR/NEC is a solid basis for any group.. Add some more pets.. or add some melee... and go dungeon crawling.
But yeah if you are sticking to duos... Druid wins for sow ports dots and snare... Mage wins for sheer glorious dps and summonable pet weaps food water n toys.. Enchanters are every bit as versatile as necros and compliment well.. Even wizards add snare and ports and stuns and burst DPS..
All these options are good ones, really. I'd pick a class that either is a role you are most comfortable with, or one thats most foreign to you. When i started on p99, i chose to play the same class i played on live - cleric... But easily the most fun i had on p99 was donking around on the class furthest what i played on live: necromancer. Sometimes the most foreign ends up being the most fun. And its ok to stink at first trying something new. Familiarity can breed boredom. Chaos is the most exciting
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