So the last characters i've been playing have had evasion. The one before that was a druid who had horrible reflex and i started to hate him probably because of it. The one before that was a Pure Wiz PM who had insightful reflexes but no evasion.
I noticed that having evasion or insightful reflexes has been a BIG deal for me. But not splashing 2 Rogue or 2 Monk also gives more options. So, how important is evasion for you?
The way i've been seeing it, evasion would be better than whatever else 2 class splashes you could give a character, better than 2 Fighter, 2 Barb, 2 Ranger, 2 Pally (Unless Sorc), etc.