I am impressed you appear to have done a little research BEFORE turning to the forums to sort out all the problems you will inherently have with the Sainshit TFT. My recommendation would be buy a GENUINE Coldtears 7" display and not a Sainshit rip-off of a Coldtears display.....
Not much more expensive, and (almost) guaranteed to work correctly with no problems with the UTFT suite of libraries by Henning Karlsen (now Rinkydinkelectronics), and not the butchered version Sainshit supply.
Do you see a theme here? Sainshit = crap rip off with poor support..... = asking for trouble....
Coldtears = poor support, but with less potential problems.... :P
You can source your GENUINE Coldtears parts here. http://stores.ebay.com/coldtears-electronics-store/TFT-LCD-Modules-/_i.html?_fsub=3830141016&_sid=680237586&_trksid=p4634.c0.m322
Advice is only that, take it or leave it, but I have already earned my stripes for the sheer quantity of people I have tried to assist AFTER they bought Saincrap and found it not worth the few $$ they saved!
EDIT: Good grief!! Saincrap not even THAT cheap any more..... $106?? Steer clear!!
Get one of these http://www.ebay.com/itm/TFT-SD-Shield-Arduino-DUE-TFT-LCD-Module-SD-Card-Adapter-2-8-3-2-inch-Mega-/121057447668?pt=LH_DefaultDomain_0&hash=item1c2f960ef4
And one of these http://www.ebay.com/itm/7-7-0-inch-TFT-LCD-module-Font-IC-800x480-SSD1963-arduino-DUE-MEGA2560-3-5-4-3-/111008432389?pt=LH_DefaultDomain_0&hash=item19d89e4105
= $76.96 inc shipping!! You're welcome!! ;) :P