I'm looking to toss in my old ipod nano in for an ipod touch and have heard a few things regarding the hardware and wanted to know.

Does the Ipod Touch 3rd Generation 8GB have less features than the 32gb and 64bg models?

Does the Ipod Touch 3rd Gen 8GB have a lower spec proccesor and open gl version than the Ipod Touch 32gb and 64gb. ( i want to use it mainly for games so this is very important)

I am aware that the 32gb and 64gb come with a mic or something and voice control and the 8gb does not. if i buy a mic can i still use voice control...?

or if anyone can point me in the direction of spec sheets that would help.
apples spec sheets are useless on this topic

Regards and thanks in advance.