The old-timey ball mice suxx0rz! They are very bad for your hands.
I have bought many different laser mice over the years, mostly from Wal-Mart. But the best one I ever bought was one I got from some Amiga dealer. It was either Amigakit or Redrumloa.
I only user laser mice on my Amigas since circa 2000.
Laser Mice FTW!