Just to let you know that I'm doing low carb (not really Atkins, but around 30g carbs / day) and I'm doing it without any artificial sweeteners (well, without any sweeteners at all).
Many years ago I switched to whole foods and mainly organics, and now I am hooked on that way of eating so it didnt make sense for me to go back to chemicals once I cut out carbs. My taste buds have adjusted just fine.
There are several articles that suggest that for some people, your body sends out insulin based on a sweet taste, even if it doesn't turn out to be sugar. The effect may not be as great as for real sugar, but for some people I suspect those insulin surges can impact weight even on a low carb diet.