Congrats on the SP. I have one that I bought new a few years ago and LOVE IT!!!! It originally came with a spurred hammer, I ended up cutting the spur off because I was having trouble with the spur getting caught on clothes when drawing. The SP replaced a S&W M649 for backup/off duty carry and I have been nothing but overjoyed with it from day one.
If you are handy, I'll make a suggestion. Go to www.rugerforum.net
and join. After 10 posts, a new section called "The Library" will be revealed. In "The Library" you will find the IBOK for the SP101. The IBOK was written by Iowegan, a retired gunsmith that worked on numerous Ruger guns. IBOK comes from "Iowegan's Book Of Knowledge". The IBOK details how to detail strip the gun, clean it out good and do a "Fluff and Buff" on the innards. I did it to my SP and the DA trigger, even with factory springs, is WORLDS better than the trigger on my M649. There is a LOT that can be done to these guns to make them a lot more shootable.
Another option, since you have the older stocks with separate panels, is to go to the "Recurring Items" thread towards the bottom of this page. There, you will find member 41 Magnum's custom stock panels. I have a set I bought to dress up my SP and they look and feel GREAT! Price is good, too. Here's a pic of mine.
Good luck with your SP. It's a great gun and should provide you with years of service.