Although I love my N900, I don't recommend it to my friends anymore unless they really want HW keyboard and are really geeky or want such geeky device and don't care about the lack of commercial apps or games.

I recommend Samsung Galaxy S over iPhone4 or Desire also.
2 of my friends have it and it's fantastic. Overall, it's the best Android phone currently out imo.
http://www.gsmarena.com/samsung_i900...review-500.php