Droid 4, since that is what I am currently using. Really anything is fine as long as it is a 5 row keyboard--I can't stand the 4 row on the priv. I personally would like to see a dedicated @ as well as something that can be mapped as a ctrl. There is not much use for alt/ctrl under android but it is useful for ssh'ing into linux, or for the proposed native linux running on the phone.