For all purpose, jack of all trades, I would get an APS-C camera because of the crop factor.
It depends on what kind of photography you are doing.
I had both full frame and APS-C DSLR cameras, because each has advantages over the other.
I also considered a camera's AF module, metering sensor, WB adjustments, external controls, and viewfinder.
I have not read any of the comments except the OP, and the first five posts, so sorry for any repetition. Mmmkay...just referring to what KmH stated. BOTH have advantages over one another, at times. But the one HUGE advantage of FF for me is that the viewfinder image is larger, and in the high-end cameras, the view is crisper, clearer, and often has a bit more eye relief. The actual camera body itself makes some difference; the D600 had a rather average viewfinder image; it's an APS-C body, the D7000, with a bigger sensor. In Nikon, the ROUND eyepiece bodies have ALWAYS been "the good bodies", and they have the better viewfinders--especially if you SHOOT WITH EYEGLASSES ON, annnnnd, you want to actually be able to SEE the outside edges of the frame without needing to scan, or move the eye around. For me, the original D3000 has the sh*++*e$+ viewfinder on any d-slr...in the newest D3300, Nikon has increased the magnification to as high as it has ever been. The D90/D7100 class has a real pentaprism so the finder image is clearer, bettter, than on the baby Nikons. The Canon SL-1 has the crappiest, tiniest finder I have ever seen on a mid-priced camera. The view through a Nikon D1x or D2x, both APS-C is the sharpest, brightest, crispest view EVER in any APS-C body...but those were like $5,000 bodies a decade ago. They spared no expense making those things.
This weekend I shot two 8-gig CF cards (339 frames each) + most of one 4-gig card, 140 frames on my D3x, and 169 frames on my brand-new, never-used-it before Fuji S5 Pro, which was built on the Nikon D200 body and AF system...and which is an APS-C sensor size. Frankly, I hate the quality of the D200's viewfinder, compared against the D2x or D3x. I shot a LOT better with the D3x and its superb, BIG, crisp viewfinder. I struggled more with the D200-class finder, even though the camera had the 200mm f/2 VR-Nikkor on it all day long...
The thing to me is, with the HIGH-end FF bodies, I can literally SEE what the heck my subjects' expressions are, and I an literally SEE BETTER what I am framing up, and what is happening. With the lesser bodies, and I have shot many (Fuji S1 and S2 Pro, Nikon D70, Nikon D40,Canon 20D,Rebel XT) lower-spec'd d-slrs over the past 14 years now, I find that the better the viewfinder, the better I can shoot, especially over full-day shoots, which usually are 745-835 frames for me. For "me" the advantage of better IQ with FF and the Canon 5D than with almost anything else used to be the reason I shot the 5D for six years or so. But with the invention of the new Sony,Toshiba,and Nikon sensors, APS-C has made huge IQ strides. Buuuuut one thing that has not changed, is the highest-end bodies like D3,D3x,5D-III,1Dx have
viewfinder systems that are simply better than the lower-tier bodies. It's a matter of degree. Nikon: square eyepiece bodies are the lower-level viewfinders. If it has a round, threaded eyepiece, it's a "pro" oriented viewfinder system. Been that way for decades.
In one kind of camera, you sort of learn to work around what you have and sort of go by feel or 'intuition' as to what you are shooting. In the other clas of camera, there is no limitation; it is simply the best viewfinder system that is on the market, and it makes a difference to me, due to wearing glasses, and wanting to use the eye-level OVF, and not shoot tripod-mounted using the rear LCD screen as a live view type of viewfinder. It's not so much about the sensor size as it is
the cameras the sensors are put into, and the price of the body. Compare an old D70 against a D7100...major improvement. Compared a D700 or D800 versus a D3x or a D4, and there's also an improvement on the viewfinder image quality on the top-end versus the old $2699 and $2999 bodies. The 5D-III has a flagship-class viewfinder because, frankly, its direct competition is the Nikon D4's prospective buyer...
**Edit. The title for the absolute sh*++*e&+ viewfinder in any d-slr actually goes to the old Olympus e-420 and e-520 or whatever. OMG...Coke Bottle Bottom class finder. Rubbish.
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