there are guys on this site with 40-50k on their odometers that have done nothing but chains/sprokets and tires, i have almost 20k and have done nothing. i have a 1972 Triumph that has 112000mi that still has original pistons rings and complete bottom end i am looking forward to achieving that with my 2002 America. The diff. between the America/Speedmaster and the Bonnie is sitting position. so whichever you are more comfortable with is the answer to that question.
with a few easy minor and inexpensive mods either will be fast enough for you.
