Hey guys whoever develops apps for iOS these days, what models of iPod Touch are still viable for game development? I might be able to get a 2nd or 3rd generation model for a really really good price, but I want to check to see if it would still be a good buy for doing game development.

I've read so far that the 3rd Generation can install iOS 4, which is the latest software for it, but I'm not 100% sure if the device is 2nd or 3rd, I'm going to ask later today about it.

What are your thoughts on this? Is it still worth it for me to get this older one just to start in on game dev on the iPod or should I hold out for a later model?