I recommend opening several different accts. broker, traditional and roth with zecco, etrade, ameritrade, and scotttrade. Limit your purchases for those stocks that are in the trough and save your trades for the sells.
Another way to hedge your risk is to day trade in a traditional IRA. Through 2009 I believe, you get a get a 20% tax credit on top of your deduction. With a 10% effective tax rate that means your hedging your risk by about 22%. The pitfall is that you won't see your money till you retire unless you take a penalty. But technically you can lose 22% and still break even.
Put your sure stuff in a Roth. The stocks or mutual funds, etf's etc. that you know will show growth and are less of a risk.