I picked up the Acoustic Upright Bass and the YinYang Bass - both are very nice. The upright is exceptionally nice for jazz tunes - I matched it with AD's jazz drum kits and am very happy with what I am getting. Now I am thinking of splurging on Impact Soundworks new Straight Ahead Jazz Horns...
BTW, the Riffer module is even more detailed than Ample Sound indicates - there are LOTS of scale choices for you to to choose from. Not sure if the DICE (random) feature is that useful - I couldn't really come up with anything too exciting using it, but it was easy to write my own lines with their new notation method and quite easy to add slaps, bends, etc.