Behold my collection of modern (i.e. year 2000+) Star Wars astromech droid action figures:
I believe I have them all except for R5-F7 (still trying to track him down at a reasonable price) and some versions of R2-D2. I’m not really interested in getting all the incarnations of R2-D2, since they all look pretty much the same. The back row in the image above consists of duplicates, but all the other figures are unique (yes, even the two black, cone-head droids on the left side of the second-last row). The front row and the three left-most droids of the second row are all versions of R2-D2; the rest are other droids from various sources (movies, comic books, Star Tours, etc.).
Update: Here is the original image with names attached to each droid: