zozee,
The Singer 101 has a larger arch than the others but is less common. The 201s and 66s are probably the best as they are more common with easily available parts and accessories. They are bigger than the often recommended Singer 15s and clones.
Some of the early White made machines have large arches as well. My Free SM Co machine has one of the biggest as does the Singer 127 and Sears sold Franklins.
This is of course just machines I've worked with there is no doubt a lot more to choose from. I can say that with the onset of ZZ machines the manufacturers reduced the available arch space significantly.
Joe