The Mark II N is proven. Does not have AF issues, which are very hit & miss on the MK III's. Yes you do have 1.5 Faster FPS, and 1.9 more total Megapixels, but beyond those two major feature increases, everything else comes down to preference. It also depends on your shooting style. Yes you may be able in 2 weeks time be able to afford a Mark III, but do you need it? Does it fit your skill level? Only you can decide if the N is worth more than the II. I have had both, and would preferably take another N over a II, if I was needing another body. But as I said, only you can decide which is the Best investment for you.