The best replacement for droid 2 is droid x.

The best alternatives to droid 2 are rated as following:
★★★★★  droid x
★★★★  iphone 4
★★★  droid 2 global
★★★  droid incredible
★★★  incredible
★★  iphone
★★  droid pro
★★  droid 3
★  droid 4
★  droid x2
★  droid bionic
★  x
★  samsung fascinate
★  droid
★  blackberry
  samsung stratosphere
  galaxy s
  lg ally
  i phone
  droid r2d2
  htc incredible
  htc droid incredible
  droid 1
  droid global
  blackberry storm 2
  blackberry bold

Your alternative for droid 2 is not listed? Suggest!
Speaking about droid 2, one probably shouldn't forget about ford sync.

Other search terms related to droid 2 and their ratings are:

★★★★★ ford sync
You have in mind a companion for droid 2 and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of droid 2 in all years. Click on graph for more.
droid 2
droid x
iphone 4