If you want to get a quick idea of what the final print might look like, get a decent photo printer. I have the Pixma Pro 9000 II that I got for a deal from B&W when I got my 5d3. Works great, can even pretty some moderately large prints, and ink lasts a good bit and isn't quite an arm and a leg. Then send off the images you want to someplace like Bay Photo. Or if you're in a major metro area like LA or NY, there's a couple of good places still around (speaking for LA here), although I haven't tried them yet. I really should.