You´re right Konicaman, there are many Bessamatics and Ultramatics for sale out there. The digital revolution brought many good cameras to the market and prices are just a fraction of the real price they should have.
My personal choice is a Bessamatic, preferably the CS model that comes with a CdS exposure meter (the others have a selenium cell and is almost impossible to find one that still works). The Ultramatic was too a good and nice camera but being automatic, had a much more complicated mechanics, so it won´t be my personal choice. The most common lens is the Color Skopar 2.8/50 which is an excellent perfomer. This lens is a Tessar design, it is 4 elements in 3 groups, and focuses shifting the entire lens, not by the front cell as it happens with all the Voigtländer RFs. Another lens and a perhaps a better choice is the Septon 2/50 however it is not as common as the Skopar and a bit more expensive.
Again, good luck!
Cheers
Ernesto