I am wondering what the best way to get filled at the open on monday morning is. i currently use limit-on-open orders on monday morning through ib's smart routing. but i was wondering if someone buys only at the open, is there a better broker out there? or does it not matter due to the opening cross? also, if i put in a market-on-open order through ib's smart routing, am i guaranteed the opening cross price? thanks much in advance.