However, they are right about the 3-button part...  I bought a 3-button
  Logitech "first mouse" to replace my 2-button microsoft mouse and let the
  old one collect dust.

Just make sure that any 3-button pointing device you buy really is a
3-button pointing device.  Some of them produce 1+3 when you press button 2,
which is ok because you can compensate by using the "chordmiddle" flag in
your Xconfig.  But I've got a 3-button trackball here that's unusable
because button 2 acts as a drag lock for the other two buttons.  I called
their customer service, but they couldn't even understand the problem.