Best Online Broker - Small $ Amounts

[chitown]

I am planning on setting up an online brokerage in the next coming months and am looking for advice on best place for my situation. I will of course do some homework myself, but wanted to get insight from those who are more knowledgeable.

I'm probably only going to invest 5-10k; with all going into 1-3 stocks at any given time. I will make relatively few trades, probably anywhere from 5-15/yr.

What site will offer me the lowest fees and trade costs given my low $ amount and volume? Thanks for any feedback you can provide!