Hello mjbharvey,
Can you give some more info about what you are welding(materials, welding processes, material thicknesses, codes/specs. you are working to, etc). Maybe someone will be able to better help you with your question if they know more about your application. I think maybe this is why no one has jumped in and give opinions yet, the question is alittle too general to answer without writing a book.
Hope this helps you get your answer,
John Wright