Which iPod touch should I get?

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I've got a smartphone now, but I find it's large screen annoying and I'm going to swap back to my old flip phone. (The smartphone's going to my little brother). I know I'm crazy for wanting a flip phone instead of a smartphone, but please don't argue with me over this. But I'm getting an iPod tomorrow, and I'm not sure which one. Like, I'd prefer to have wifi and apps and stuff. So therefore, a touch. But I can't decide between the 4th and the 5th gen... Are there enough differences between the two to warrant the upgrade to the 5th generation? I'll use it a lot for listening to music... And probably multitasking with music playing in the background, and games, web browsing, social media, etc. I'm not particularly worried about camera quality though. But I like the colors of the 5th gen ones. I think my mum cares about price, but I may be able to convince her to get me the 5th gen but I don't want to make her get something expensive and not worth it. Thanks And also, if I get the 4th generation, is IOS 6 worth upgrading to? I've seen reports of it being laggy, buggy and unusable with force crashes when it's run on a 4th gen iPod.