lvl 90 a1 merc offers SLv29 Inner Sight(Def-1515). Other than Ubers, this is enough for you.

My Uber-Killer-Strafer maxed Inner Sight btw

Insight bow on a1 merc works, it's budget and there's better mercs but it works.

I eventually swapped to might pride merc and enjoyed the huge damage buff. If your playing tz with this build your drinking juvies for mana. Everything dies