I have been using this one for the last 8 years:


(magic wand)
I use it on both of my PC's. (there is no shadow on XP, even if you have that setting enabled)
Shows up well on both light & dark backgrounds and the animated blinking tip (looks like little yellow sparks) lets me know if my old 9x PC is frozen or just being extremely slow.
I have tried some others, but I keep coming back to this one.
but I see that switching to a left facing cursor, might throw you for a loop. Did I get you dizzy? 
-thefritz_j
Those are actually perfect for left handed people. They make more sense when you are using your mouse on the left side of your keyboard, with your left hand.