dadelcas,
The order of the builders is not important.
Here is some information about the builders :
Java Builder – Eclipse’s builder that does Java compiles and indexing
Structured Document and Model Builder – Our builder that builds the internal
models upon which the structured editors (XML, XSD, JSP, etc) work on.
Enables you to use our additional editors in that project.
Deployment Builder – Our builder that keeps your exploded deployments in
sync when you change stuff
Validation – Our builder that revalidates files on save if you have
validation turned on for that particular artifact type
Maven Project Builder : This library is used to not only read Maven project object model files, but to assemble inheritence and to retrieve remote models as required
I suggest you try a Google search to get detailed information about the various builders.
Hope it helps.