Well... since I own all three, I feel I should comment. Since you said accuracy above all else, Im going to say, in my experience, the Single Ten and the 617 are equal. I would have never believed that, but the Single Ten has better accuracy than I expected, and my 617 has less accuracy than I expected. My 617 is a 4" model, and will group 2" rested at 25 yards. The Single Ten will also group that well. The SP101 is very close to that performance. As far as plinkers, the SP101 and 617 have the advantage because they are Double Action, and load/unload is easier. The Single Ten is fun, and doesnt run out of ammo near as fast as my Single Sixes do, but as a plinker, a Single Action just loses a point when grading it against a Double Action. I know there will be lots of guys screaming about that comment, but its how I feel. If I could only keep one of those three, it would be the SP101. First of all, its 9 oz. lighter than the 617. The balance, design, and performance is perfect for an all around great 22 revolver. Its accurate, beautiful, and built to heirloom quality. The trigger has smoothed out nicely, and although the pull is long, it stages perfectly every time. I took out the factory trigger return spring and replaced it with a Wolff 8#, but left the factory mainspring in to keep reliability. I have eight .22 revolvers, and the SP101 would be the last to go.