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Not sure how long it took, but here is what I found. Didn't get to test at all profession spells and the only critters I cast at were fengs( these are equal to halfling wizards).
Did a bit of testing, not as much as I would have liked but still will give some idea as to the affect of the change. This is a 27 wizard with 20 ranks in mana share casting. I cast at myself, a young ranger, and a critter and the numbers of mana spent to spell dispell matched on all three of us so I think its the caster and not the target that affects the mana. Not sure if it's age or mana share. One thing is definte as you will see, it costs more to remove a spell unknown to you is quite a bit more than removing a spell you have the ability to cast.
Spell: Cost to Dispell
401 : 6 mana
406 : 8 mana
414 : 12 mana
503 : 7 mana
507 : 9 mana
508 : 9 mana
905 : 8 mana
911 : 11 mana
919 : 15 mana
101 : 10 mana <--
102 : 10 mana
103 : 11 mana
105 : 12 mana
107 : 13 mana
601 : 10 mana
602 : 10 mana
604 : 7 mana <--
606 : 13 mana
prepped spell : 17 mana
shut off an amulet: 17 mana
Thats all I had time to test I had bad connectiong and kept getting booted. Two big things I noticed:
1. To dispell a spell you know costs much less ( I would love for a sorcerer to try this out and see if the costs match mine for spirit and elemental to either prove or disprove this)
2. 604 the ranger skinning spell did not seem to fit the pattern, maybe because it is a utility spell this is the reason not real sure.
Like I said not a complete test but just a good starting place, let me know if you have anything to add/change.
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reg