Need Info regarding splashing for evasion.

Right, i am finally considering splashing 2 mnk for evasion. Being able to run around essentially anywhere seems pretty lulzy. however i am concerned about the effects on my dc/ spell pen

I lose-
2 spell pen
2 int
1 feat net. (translates to one less DC on ench.)
some sp (both from capstone and not taking the levels)

I gain-
evasion
1 more toughness.

now, i am wondering whether a more or less max DC wizard (at lv 18 atm, 43 necro 43 ench) really cares about the loss of the DCs at endgame (like the new epic stuff)
(i have 2 wiz past life) Also, how perfect should spell pen be? will losing 2 spell pen put me below the "they only save on a 20" range?

my first priority is to be as effective as possible with CC/Necro (and dying is very rare when capped, the evasion is essentially just icing), but if my stats make that the extra few points irrelevant, evasion seems pretty sexy :]

If you are going to be running epic hards it doesn't matter. If you are going to be running epic elites you
need at least one more wiz past life and to be an elf to hit no fail spell pen on a pure 20 wiz. You can
drop a bit of spell pen if you are willing to have no fail on all but EE priestesses in deal and the demon.

It really depends a lot on how you play and what you play. A 53 DC in epic elites seems to let me get mobs
in fathom maybe 1 in 5 more like 1 in 10 on ee. Debuffs will help that obviously and given that many/most
melees now carry improved sunder they come pretty often and of course you can do your own. Now you can
get a DC of 55 on a pure (I'm missing 1 from new gear and 1 from human/drow).