I was in this dilemma.
Then I did some research. Based on benchmark, SD652 is like 3% faster than SD650 and it is on benchmark. Plus I never like to store pictures and videos on phone's internal storage. Reason is that if the phone is dead, that's it.
Whereas with microSD card, we can just take it out and put into another phone.
With the above consideration + cheaper + option of global ROM now, I went for Mi Max SD650 / 3GB / 32GB.
Same here. Especially if you need to send in for service. A dead phone give you no chance to erase the data and hance service person may have access to it after service.

