I second the motion of the Copan Ruinas crossing. Super easy. The customs and immigration officials were some of the nicest of all Central America. Do remember your extra copies of all important papers. There is one place to make copies at the border, but I was unlucky enough to get them on their 3 hour seista(sp?).
Also, not sure if they fixed it yet, but there is one section of road on the Honduras side half way between border and Copan that is one dangerous S.O.B. A portion was sunken atleast halfway across the road and a foot and a half deep, on a blind corner none the less. It nearly got me! Two separate locals in Copan told me about a motorcyclist that died there only a week before.