Apple does not currently sell a new 64GB iPad 2; only a 16GB model. Do you really need a 64GB model? The iPad 4 has more features than the iPad 2 and is much faster. Since this is a user to user forum, and not Apple employees, we have no way to know Apple's plans for iOS 7.
16GB vs 32GB vs 64GB: Which new iPad storage capacity should you get?
http://www.imore.com/2012/03/08/16gb-32gb-64gb-ipad-capacity/
How much content will fit on my iPod or iPhone?
http://support.apple.com/kb/HT1867
Compare iPad Specshttp://www.apple.com/ipad/compare/
iPad 2 vs iPad 3 vs iPad 4: Which Is the Best Buy?
http://ipad.about.com/od/Tablet_Computers_eReaders/a/iPad-2-Vs-iPad-3-Which-Is-T he-Better-Buy.htm
http://www.techradar.com/news/mobile-computing/tablets/ipad-4-more-than-twice-as -fast-as-ipad-3-benchmarks-reveal-1108743
http://www.digitaltrends.com/mobile/ipad-3-vs-ipad-4/
iOS 6: Which software features does my iPhone, iPad, or iPod touch support?
http://support.apple.com/kb/HT5457
Consider getting a refurb model for less $. Has new screen, back and battery. Same 1 year warranty as new iPad.
Buy a Refurbished iPad? The What, When, Why and How
http://www.maciverse.com/refurbished-ipad.html
Cheers, Tom 😉