Stretch your buying power, but watch the cost. A margin account lets you borrow against the equity in your account to buy stocks, which stretches your buying power. You're charged interest, of course, on the borrowed funds, but margin rates vary wildly . Check them out, and be sure to factor them into the cost of the trade. Checks, sweeps and interest rates.
Most brokers offer money market accounts.
Tools of the trade. Frequent traders may be better off by going with the lowest commission and doing their research elsewhere on the Web. Depends on how much the broker charges for the use of its tools. Talk the talk. And, speaking of orders, if you use stop or stop limit orders to protect your profits, be sure you pick a broker who accepts them.