| Even though you posted this a while back, here goes...
While I myself have the Zimmerman, I think it's a good edition. it's interesting to note how, if you look at the DB part on the piano score, there are alternate bowings and even extra notes, like an open G under the descending triplets in the last repeat section...it gives the section a good effect.
As for other Bottesini works, my favorite include:
Concerto No. 2 (of course!), Bolero (with a wonderful cadenza!), his elegies, and his Fantasy on a theme from Rossini's "La Sonnambula". The last one is the easiest of them all, I think, and a really flashy piece. You can find a lot of Bottesini pieces in the York editions. | 
