I have a Xenotar 105mm ƒ2.8, but I prefer the Nikkor-M 105mm ƒ3.5. Its a tessar like the other M lenses but is fast, unlike the other M lenses. Its image circle is 110mm which covers 6x9 with minimal movements, and 6x7 with a little more space to move.
Also Nikkor and Fuji made their plasmats (W series for both brands) as short as 105/100mm. They are a bit easier to find than the Nikkor M. They're both ƒ5.6. I don't have the Nikkor but I recently bought a Fuji 105mm CM-W to function as a light weight wide for 4x5, since its image circle is 174mm.
I've looked at Schneiders and Rodenstocks, but aside from the Xenotar that came with one of my cameras, I have stuck with the Japanese brands for this use. (I also use them with a 6x4.5 digital back.) Any of the lenses I mentioned above except the Xenotar can be found for $300 or less.
EDIT: Another lens I forgot is Horseman/Topcon made lenses for their 6x9 cameras. There is a 105mm ƒ3.5 version, but I have the 4.5 version of the 105, so I can't comment on that one (but it is likely to be much easier to find and cheaper than the other lenses I mentioned.)