Peter - I was under the impression that for smaller heaps, under 1.5GB or so, a 32bit JVM is more efficient. Hence my interest.
That is a good point about copying the java directories around...I could probably try to do an install to a 32bit CentOS, RH, or Fedora and try copying it over as a test. Thanks for the suggestion.
At this point, I may just chalk up the 32/64 difference as diminishing anyway and go with 64bit. Thank you all for the responses.