Sure you can sell further out and get more premium, but more time for things to go wrong as well.
What is the percentage of return you are looking for utilizing this strategy?
Many times you can sell one month out more times and make a higher percentage of return in the long run. If you are with a cost effective broker, a month at a time is better. Also selling more often (a month out at a time) rather than netting larger premiums further out allows you more opportunity to take advantage of any high volatility situations that may arise.
Big premiums look good, but can cost you in the long run. Sometimes making two bucks is better doing it one dollar at a time rather than all at once.
Good Luck,
as always, just my .02