I'm not sure what drawdown you're prepared to take but generally if you close out trades before earnings releases, big losses are relatively rare. As I noted earlier, you cannot predict one off announcements such as what occurred with Merck. The other thing to bear in mind is that when a big company such as Google announces results, other stocks within the sector usually follow suit, often leading to big overnight movements. Just something to be mindful of.
I generally trade from close to strong support/resistance levels, thus minimising losses and potentially gaining from the bounces that often occur in these situations, particularly from stocks that are already in an upward trend.
I can't really recommend specific stocks as most of the stocks that I trade tend to be quite volatile (e.g. Ebay, Apple, Amazon, Pixar). Starbucks may be worth a look, at the moment, as it's hovering above the psychological $50.00 level. It's been in a downward trend since December but the long-term trend is up. Apple is currently in a strong upward trend but it can be volatile so be careful. I would buy if there is a pull back to around $77.00-78.00, with a stop loss at just below $76.00 but this is only my humble opinion. Others probably have different views.
You also asked earlier about getting info on US stocks. I don't know if you have Sky or one of the other satellite providers but two really good shows to catch are "Bulls & Bears" and "Cashin' In" on the Fox Channel. They broadcast on Saturdays at 15.00 and 16.30 respectively, both GMT.
If you want to read some books with good tips on how to improve your chances in the U.S. markets, I would recommend the following:
1) High Probability Trading - Marcel Link
2) Secrets for Profiting in Bull and Bear Markets - Stan Weinstein
3) Winning on Wall Street - Stefan Zweig
4) Trend Following: How Great Traders Make Millions in Up or Down Markets - Michael Covel
Others may have different recommendations but hope that the above is helpful.