I was looking at the Nikon S3000, S4000 and S70 yesterday. I ended up buying the S8000.
The S3000 is very affordable. I found it on Amazon for $131 and it was at Best Buy for $140. It's very small and has some basic functions plus vibration reduction which is always nice. The screen is just ok for me, because 2.7 seems a bit small.
The S4000 is the same as the 3000, but has a touch screen and HD video at 720p. I don't like touch screens because I find it horrible to operate when you have bunny fur all over you, not to mention that the LCD screen is usually pretty horrible on the touch screens. The screen is bigger than the 3000 at 3". Price ~$170-199
The S70 (~$270-299) has a bigger screen than the other two so the body is a little bigger too. It is a touch screen and shoots HD video. The sample was busted so I couldn't see if the screen looked better than the S4000, but I doubt it would be a nicer screen than my...
S8000, has a 3" screen, costs the same as the S4000 without the touch screen (yay!). The color on the LCD is just fantastic and the resolution on it is great.The way I see it, the S8000 and the S70 tradeoffthe touch screen for 10X opticalzoom. I'd pick zoom over touch screen any day of the week!It's a 14MP camera (in my opinion anything over 5MP is overkill for regular pix, especially if you don't intend on printing them). It has vibration reduction, HD video mode, and a ton of "scene" selections. 10x zoom is pretty great, but you need a steady hand. I got some good headshots of the buns with the zoom.Because of the optical zoom, the front of camera bulges out a little bit, so the camera is generally a bit larger than the rest that I have mentioned, but by all means is still a small camera that'll fit in your hand and purse very easily. I bought mine at Best Buy for $270 (they price matched their website).