Depends on your own situation. Do you think you'll need to store lots of music and photos? I have a 16 gig and it's plenty for me.so would 32 g be enough or is 64 g much better
I've never used the first generation but friends that have used my iPad2 have commented on how much quicker it is.and is ipad 2 really much better than ipad 1 besides that you can take and play videos on it.
Cheers
Jamie