I have little doubt that the perceived utility of 64 gig vs 32 will not be all that noticeable untill you have used the machine for a while.
Forget about all of the things the iPad does they are not important in terms of this buying decision.
Learn about what the iPAD will NOT do for you. If you need to iPad to do the things that are on the list of what it will NOT do then don't buy it.
Yaesumofo