i don't really agree with those declaring a minimum. i mean - i am probably a biggest proponent of speed in the press in the history of HD, ive harped on that well past being blue in the face. back in the day, the #1 priority for my teams was making sure we were super fast to capitalize on the press.
that said, i would NOT hesitate, in d3, d2, or even d1, to sign an otherwise great big with 1 speed. its just not very important, IMO. speed at the 1-3 is vital. speed at the 5, not really. ath is still vastly more important than speed for big men in the press, and you really are not going to notice the impact of 20 spd vs 1 spd at the 5, so i see no reason to set those minimums.