so far I'm getting terrific results from my Fujinon-SW 90/f8.
small(ish) lens, but in lower light, a 4.5 would be nice for a brighter ground glass.
I used a 90mm 6.8 APO Grandagon at school, and it was a terrific performer. If you shoot color films, you'll probably want to get a multicoated lens.
a friend has a Super Angulon 5.6/90, and he's shot ALL his interiors over the past 15 years on it(along with other lenses of course). But its his mainstay lens 75% of the time for interiors/exteriors.
-Dan