OK, it looks like I either have those already or they're on the list. Edited my last post with the ones I'm gonna aim for sooner or later. I don't care about the Attack->Spell RMs because I have Meteo, Ruinga, and Summons decently honed also you can't really effectively autobattle the EX++ Dailies in JP. Thanks guys.
EDIT: Oh this is the top post on the next page. This is way more convenient for me to put this info dump. Here we go!
RMs I may want that require an MC2:
Arc RM3 (Staff: MATK+10%, MIND+10%), already have MC2
Galuf RM3 (Fist: Damage 1.2x)
Locke RM2 (Dagger: Damage 1.2... I got a shitton of daggers, yo. Also Locke Waifu)
Reno RM2 (Rod: Damage and Black 1.2x), already have MC2
Laguna RM2 (ATK+10%, DEF+10%, Start: Regen)
Sazh RM2 (Double Hit), low priority, will receive MC2 in current event
Echo RM2 (MATK+10%, Start Blind)
Evil Princess Sarah RM2 (and 1 for that matter) (Attack -> Heal)
Sabin RM2 (Dualcast Monk)
Yda RM2 (Attack-> Kick)
P.Cecil RM3 (If hit with physical, 30% chance to heal... low priority)
Zidane RM2 (Dualcast Thief) useful if I hone Thief's Raid, RM2 already acquired
Snow RM3 (Fist: ATK+10%, DEF+10%), will receive MC2 in the current event
Red XII RM3 (Support Fountain)
Vaan RM2 (Dualcast Celerity), MC2 already acquired, low Priority
Gau RM2 (Attack +10% and Haste)
Squall RM3 (SB Gauge increase 1.5x on taking damage)
Auron RM2 (Dualcast Samurai), Low Priority
Balthier RM2 (Dualcast Engineer), MC2 already acquired, low Priority
Tidus RM3 (SB Gauge 1.5x on Ability use), same as Ramza's but another one won't hurt
Firion RM3 (ATK +10%, DEF+10%, Start: Regen), already have MC2
Celes RM2 (Spellblade Damage 1.3x... may already have), already have MC2
Steiner RM3 (SB Gauge 1.25x on Ability use and taking damage)
Jecht RM2 (Attack -> 14% chance of Barrage)
Note to Self: I already have it, and Agrias' RM2 (Knight skill dmg 1.3x) is gonna be pretty good if I decide to hone Saint's Cross. Looks like Tidus and perhaps Firion or Sazh will be the folks I try to get to 65 before the end of the Orbfest. Otherwise I'm gonna focus on getting everyone else to 50, a much more attainable goal. Regardless, I can probably go ahead and spend my MC2 lodes on the folks whose MC2s I don't have and not worry about it too much, it looks like.
To have everything in the same post...
RMs I want and don't have that only require MC1s:
Mystic Knight RM2
Fusoya RM2
Samurai RM2, need MC
Shaman RM2
Bard RM2 (Attack: MT, but 0.6x), Daddy I'm a Farmer
Zell RM2
Edward RM2
Ninja RM2, Low Priority
Kimarhi RM2, Low Priority, need L50
Setzer RM1, Low Priority, need L50
EDIT: Added a couple I missed in adding to the list