First, find out if your going to go long or short by looking at the long term trend in the S&P500 on a weekly and daily bases. It would not hurt to look at the small cap($dwcpf) and the NASDAQ to see if they agree.
Second I suggest you go to Select Sector Spiders and pull up the chart (click here), put it range on one month and find the top two ETF’s.
Third, now go to the best ETF like XLB and under holdings you will you find a list of stocks. Download the xls or cvs file and start to review all the stocks in that list which should give you a big head start.
This is all free, and it will always put you on the right side of whatever trend you decide to trade.