Congrats on your new kitten! There are really two issues at play here.
First, the quality of the food you feed your kitten. There is no clear cut answers. My understanding is that Natural Choice is a decent food. Not the best out there, but better than A LOT of other brands. You can read about the foods people choose to feed their cats at this thread: http://www.thecatsite.com/forums/sho...d.php?t=137404
The second, and probably more important, issue here, is the age of the kitten. 6 weeks is really too young for a kitten to be away from it's mother. Most kittens start experimenting with their mom's solid food at 6 weeks but are not fully weaned. I'm not sure of the situation, but if it is possible for you to wait AT LEAST 2 weeks (I know it's hard, but 8 weeks is the minimum a kitten should be take away from it's mother....10-12 weeks is better) to get your kitten, it is probably best.
Folks with more experience can help me out here, but I think a 6 week old kitten should be getting wet food mixed with some KMR (kitten formula) for the first little while. Likely every few hours. You can keep the dry out for him/her, but I don't know that they'll be eating enough of that to eat it exclusively.