My criteria for stock selection

Currently I am focused on using the following criteria to screen my stocks :
1. Financial strength :
Market cap > $1 bil (= reasonable size, stock liquidity, analyst coverage, institutional ownership)
Consistent profitability for the last 10 years.
For an income stock I am looking for uninterrupted dividends for past 20 years

2. Valuation and Growth ratios:
P/E less than 20, P/B less than 2.5
- according to Graham P/E x P/B should be less than 22.5
EPS growth 15% and above annualised over last 5 yrs
Sales Growth 15 - 20%
Gross margins 25 - 40%, and trending higher
Positive operating cash flow over last 5 qtrs, and trending higher

3. Management effectiveness :
ROE > 25%, ROA > 15%, ROS > 17 - 25%

4. Operating Leverage :
Debt/Cap <25%>
My strategy:
I try to establish the intrinsic value by using a DCF model to estimate future free cash flows FCF, then compare the analyst estimates to current market values to assess a fair value for the stock.
I also look at the quality of management, net asset values NAV, and the return on invested capital ROIC.
Apart from good operating indices, I am also looking for the company's "moat" i.e visible competitive advantage, its place in the industry, pricing power and trends.
I am looking for the company's historical ability and future potential to create shareholder value.
Overall, I want to buy a good company at a good price.
Next, I establish a margin of safety and wait for the price to reach that level.
After buying, I will hold it as long as necessary.