I'd go after the following:
Wide: Nikkor-SW 90mm f/8
*Large enough image circle to cover 5x7 with some movement potential, great for color shooting too. Quite even in light distribution, but with any WA lens and not using a center filter, you might find some vignetting/darkening of the corners.
Normal: Fujinon-A 240mm f/9
*very small/light lens, Copal 0 shutter. Tremendous lens. Great for close-up, but equally capable for infinity situations.
Long: Fujinon-C 450mm f/12.5
*small, in a Copal 1 shutter, very large image circle. Tremendous lens
I own and use the 240A and the 450C within my 5x7/4x5 kit. I'd be using the f/8 Nikkor, but found a steal of a deal on a 90/4.5 Nikkor, so went with that instead.
I primarily shoot color film, and drum scan. So getting the highest quality out of the film is important. As is the weight savings of the smaller lenses vs the larger plasmats that are easily sourced, but heavy to lug around.
-Dan