Ask yourself why you want to move to FF. There's a lot of smoke and mirrors and dare I say it snobbery about FF vs APS-C. There are benefits to both which you have to review against your picture taking requirements. Sure FF has better high ISO capability but unless you consistently shoot at ISO>1600 is this really a reason to change? And as sensor tech improves, the gap is closing. FF has higher dynamic range, but unless you always save as 16 bit TIFFS and view on the highest quality monitors you will barely see the difference, certainly not if you print on a typical A4 or A3 photo printer. FF has better control over depth of field, but then you really need expensive f1.4 or f1.2 lenses to benefit from this. At low ISOs, APS-C will give better detail and resolution than FF at a given MP rating because the pixel size is smaller. APS-C gives you extra reach for wildlife shooting but still allows great ultra wide angle shooting unless you want the 8mm fisheye effect (but again is this a reason to change?). FF are overpriced compared to an equivalent spec APS-C, so you could be a decent camera and lens for the price of a FF body. After all, a good lens is the most important bit of kit you have.