highest until it changes, which it will. However you can move along to always be in the best range of isk/lp, while this is very difficult with burners (I tried and the faction standing keeps going down).
Plus when I select the offers, I take 2M LP worth and consider the price at SELL of items to buy and price at BUY of items to sell , which means you have some space.
It took me one double click and three clicks to have this list of agents, sorted by worth, from the market of Jita. Not a big deal to make three clicks every day to be sure I am in the best range.