I got a few Jazz upright basses - also
VSL Upright Bass,
Acoustic Samples The Upright and
Premier Soundfactory Acoustic Bass 2.
The bass I use mostly is the Acoustic Samples one because it just feels best in a lot of situations and also gives a good control over the articulations. Unfortunately the demos dont show the strengths of the instrument well IMO.
I used the Acoustic Samples Upright in these 2 pieces - dont know if its too much burried in the arrangement:
I also like the sound of the Premier Soundfactory bass 2 - there are so many nice little details in the recordings. The downside is that you dont have much control and also that this developer doesn´t even thinks it would be necessary to even have ANY GUI - he also doesn´t seem to respond to messages. A guy here on VI-Control even took the time and created a nice GUI and offered this developer to just use it. No reply. A very talented engineer from Okinawa if I remember correctly, but as it seems quite shy.
Btw - even the very standard factory double bass in logic pro isn´t that bad. I used quite much when I started making music:
There are fancier basses out there, but for a bass that comes with the DAW its really not so bad IMO.