There's only two Improved Evasion items I know of in the entire server, only one of them dropping: A light, Studded Leather armor. The other was a ring, and I doubt any of the current characters have that >.>+3, Improved Evasion. Now, what other class is there that can only wear -light armor- that does not have Evasion/Improved Evasion available as a feat already? They're either wearing full plate, medium armor, or lighter equipment that doesn't give them a bad wedgy because they're spellcasting or sneaking up on someone.
What classes can only wear light armor isn't the issue- the issue is that ANY class that can wear ANY armor can wear light armor- this means, for example, that a barbarian15/weaponmaster10, or a paladin/champion of torm, or a bard/CoT(or BG), or a druid... or -any- other combination of classes that normally wouldn't even get regular evasion, can all keep a suit of improved evasion handy anytime they plan to face a caster. What's more, if it's a dedicated caster, they can do so freely with little worry about how it will affect their AC to go from fullplate to studded leather- How many mages do you know with a +20 attack bonus? Dropping 5 AC vs. a caster throwing balls of lightning and fire at you for improved evasion is a no-brainer. Just because it's on studded leather doesn't really make it okay- less so if it's dropping frequently enough that it's well known that "most people" sell it. As I said before, mechanically, it's the equivalent of (not even- really, it's more powerful than) putting +3 studded leather with crit immunity or sneak attack immunity into the loot tables. I dunno much about the ring- I believe I've seen it once, and I have no idea where it came from, so I'm not really very well able to discuss it- but I can pretty easily say that if I had the option, every single one of my characters would own one. Dropping 3 to a stat for improved evasion against a caster throwing fire and lightning is as much a no-brainer as dropping 5 AC.
I repeat my earlier premise- when you view it simply as "losing" and "winning," and disregard all other aspects of what's involved, losing is never fun. Realistically, that necromancer's fun is ruined just as much by being IKD spammed so much that he never gets to stand up and cast a spell as your day is by running forward and dying instantly to a death spell.
Don't forget, clerics aren't the only ones who cast/benefit with wisdom bonuses. Paladins, druids, and rangers can gain a degree of benefit from this as well- most druids I see either spam AoE static spells like clerics do, or buff to the gills then shapeshift.
Yes, wisdom only comes from necks. Personally I don't see it as a problem considering Clerics are in my opinion the most powerful class in the game.
The wisdom being available more readily would result in slightly higher DC's overall for wisdom casters, but as a result, that little bit of increase would also encourage a bit of diversity- rather than casting SoV, SoV, Divine power, divine favor, charge, a cleric might cast silence, poison, then hammer of the gods.
I'm not sure I follow. If wisdom was available on gear ALL DCs would be higher, including the frequently used spells. It doesn't encourage diversity in any way. Having a good chance to land both a crappy spell and a good spell doesn't make me any more likely to want to cast a crappy one. The only way to encourage diversity is to make the weak spells more powerful, not increase DCs across the board.
Helmets: +2 CHA (LOTN) +3 INT Cloaks: +3 CHA Boots: +3 DEX +3 CON Belts: +3 DEX +3 STR Gloves: +3 DEX +3 STR Armor: DEX +2 (LOTN) CHA +2 (LOTN) INT +2 (LOTN) Rings: +3 INT Necklaces: +3 WIS +3 CHA Weapons: Any +2 (LOTN)