I'll second David's recommendation for an older Symmar convertible lenses. They were available in a lot of focal lengths, and the prices have stayed reasonable over the years. Many suffer from "Schneideritis" where you'll see white specs at the enge of the lens, but that's not a problem. It's only on the outside edge of the lens so it can't impact the image quality. If you try to use one in the converted state (by using only the back element), use a colored filter to avoid chromatic abberations. Yellow and orange have worked well for me; I've not tried a red filter yet.
As David mentioned, the Synchro-Compur shutters are workhorses. I have three in my collection, and two of them just needed to be fired about 100 times to loosen them up. They've since given me a few years of very reliable service.
If you decide to look into a 90mm Angulon (non-Super), you might try to find one that has the Linhof name on it. The story goes that Linhof "cherry picked" the lenses that they sold, so with the Linhof lenses you have a better chance of getting a good lens. I have no idea how true this is, but I did luck into a cheap Linhof 90mm Angulon a few years ago and it's a great lens. Very tiny (helpful if you have to walk some distance with your gear), sharp, easy to focus...about all you can ask for of such a small lens. It doesn't have the coverage for a lot of movements on a 4x5, but it versatile enough for many situations.
As Matt suggested, try out the 127. You might find that you like it. If you don't, then it never hurts to look at what's out there in your price range in newer lenses. A more modern lens in the short-normal range is easy to find from Fuji, Nikon, Schneider, or Rodenstock. Newer lenses will give you more coverage, and therefore greater movements.
Regarding the focal lenght equivalence between your 127mm lens on 4x5 and 35mm lenses, there is no absolutely correct way to convert what the lenses look like because 35mm is a 2x3 format whereast 4x5 is, well, 4x5. The rule of thumb that works for me is to divide the LF lens by 3 to get an equivalent focal length in 35mm. Thus your 127mm lens is about the same as a 42mm lens on a 35mm camera. Put the lens on the camera and look at the image...I think you'll find that the lens is closer to "normal" than "wide angle".
Finally, I strongly suggest a trip over to Kerry Thalmann's large format pages at
http://www.thalmann.com/largeformat/ . The information density is amazing, and his recommendations are first rate. (Plus he's one heck of a writer.) You can learn more there in an hour than you can in a day at the library.
Best of luck.
Dave
