The phone that's closest to the Nexus One as far as features and look would be the HTC Legend.

The internal upgrades are minor, when you consider it next to the HTC Hero, but like the Empire Strikes Back, sometimes sequels are far better than the original. While we found the Hero "tragically flawed" in its slugginess, the Legend's slightly more powerful 600MHz processor behaved-well, like a legend. The 3.2-inch screen has the same amount of pixels as the Hero, but swaps the HVGA for a more superior AMOLED. The 5.0-megapixel camera is still the same quality, but has the much-welcomed addition of a flash. You get the picture-the Legend is building on the Hero's quality in incremental upgrades, but every change, however minor, radicalizes the experience of using the Legend.

Well if you are looking for the full review, you should head over to gizmodo.com, the guys over there did a really nice review for the HTC Legend.

Source:  gizmodo