Dear Brad,
Every 5x7 user I have met (and that includes 13x18cm and half-plate users) does indeed see it as the ideal format: big enough to contact print (4x5 really isn't) but small enough to enlarge (5x7 enlargers aren't THAT much bigger than 4x5, and a LOT smaller and easier to find than 8x10). Once you try it, you're hooked.
For years I suspected it was the ideal format, purely on theoretical grounds, but coukdn't find a camera at the right price -- and then, by chance, about six or seven years ago I got two and a half in one year, a Gandolfi Variant, a Linhof Technika V and a 5x7 back (the half) for my De Vere 8x10 monorail. I was delighted to learn that I was right: it is ideal.
I've had two or three articles published where I plug it as such (one in
Shutterbug), and I'll be pushing it again in the next Shutterbug buyer's guide. I also commend it highly in the free module in the Photo School at
www.rogerandfrances.com where I run through the large formats that are currently available, and why you'd choose one over another.
I don't shoot a vast amount of LF, even though I have cameras from 6x7cm (Linhof) to 12x15 inch (Gandolfi) because it's a hassle -- but with 5x7, for most subjects, the hassle is at the minimum and the rewards are at the maximum.
Film choice? Still plenty from Ilford -- and remember that you can always switch to 13x18 or half-plate, because the holders have the same external dimensions and differ only internally.
Cheers,
Roger