1)A sample of 1000 is a big, reasonable sample. Many, many of the studies I've done over the years have been with smaller samples -- honestly, a sample size of about 250 to 300 is usually enough for a high level of confidence in your results, although on a big "strategic" study, like the landmark study that fed into the development of 3E, you usually like to have a bigger sample...though, that's mostly because you will frequently divide the respondents into subgroups during the analysis (e.g., older vs. younger, casual vs. avid gamer, etc.)