CONGRATULATIONS! One more down and plenty more to go!
If you are looking for security pins, try out an ABUS or American, of course

The master that you have has some spring tension to overcome right? I have a similar one without security pins.. I would like to try the one you guys are talking about. I have a Brinks R70 Diskus style padlock that is not very hard... It was a challenge at first, but now it is pretty easy. It has a little spring tension to overcome and what feels like a spool or two for your picking pleasure! It is only a 4-pin like I believe the Master #40 (the diskus style one, correct?) Then there's always the original ABUS diskus
I have not had much luck raking American or ABUS locks. I like the feedback from the ABUS locks that I have dealt with

I like American, but I don't care for the way they feel. I just like the satisfaction of knowing I can open them even if it takes a while!
Picked at 2 shackleless Master padlocks the other day. I could open fairly quickly and the other I just quit messing with because I had stuff to get done. One was a Pro-series I believe... Something else for you to try

I think it had 3 spools, and is the only masterlock that I think I have encountered with spool pins. I borrowed these from a friend for the day while he ran some errands.. I didn't want to give them back but unfortunately I did..

They felt more like a door lock to me than a padlock. Harder than a Kwickpick, er, uhm.... Kwikset

ahahahaha!
(I certainly hope kwikset doesn't make padlocks! YOW!)