Dxg 305 and 506 camera etc

[fishycomics]

I see hanshing or dxg has a newer style camcorder, the 305 is and was a 3 meg with a 6.6 interpolated at 99

now the 506 is a 5 meg camera cmos lens at 159

http://store.yahoo.com/americanesuperstore/dv-9300.html

I wonder what difference in these cameras are? just an update model? as well as the higher end one that is new I forgot the model 638 digilife Ispn take off as well as mustek.

just a common question