As my first project I'm building a simple box. It requires a block plane and its a good excuse to buy my first plane.
Hi Dan
Of the LN #102/103 and LA 60 1/2, my choice for you would be the #60 1/2.
I have both the #103 (my first LN plane several years ago) and the #60 1/2, and as much as I think that the #103 is one of a few planes I'd take to a desert island, I believe that you'd get more use out of a plane like the 60 1/2.
It is not just the wide blade. It is not just the adjustable mouth. It is that the #102/103 has a coffin shaped body, whereas the 60 1/2 has straight sides. Since you are going to making boxes, I do think that you should consider making a small shooting board. Of the above planes, the LA #60 1/2 is the best choice.
Now as much as I like the LN #60 1/2, I consider the Veritas DX60 block plane a superior design. It is the same size, costs the same, but has better ergonomics. Side-by-side you can tell this. Individually, these planes are both fantastic. You can't lose. But look into the Veritas - you won't regret it.
My review (that compares these planes in detail):
http://www.inthewoodshop.com/ToolRev...lockPlane.html
Regards from Perth
Derek