I have more than one bike but often go back to my S40.  The weight and handling feel more natural to me and if I am going to ride on gravel roads I prefer my Savage.

You've all given many excellent points.  

Keeping as a guest bike seemed a good reason, but I feel like the the S40 won't make a very good guest bike.  It's not going to be able to keep up with me on the CBR and I feel like it's too noisy for me to be able to communicate well on intercom.  Sure, I could put a different silencer on it, but I really like it like it is.  

Keeping for when the CBR is being serviced is perhaps the most practical reason, but I'm buying a Yamaha R3 or Ninja 300 for my wife and I could ride that during those times.  I'm still on the fence about which to buy and would happily take any advice.  

Regret.  Yep, been there.  My love affair with motorcycles really only began after I bought my first Aprilia.  I will always regret selling that one.  This is different though.  I feel like if I ever regretted selling her that I could just as easily get another one for pocket change.  We can get these any day of the week for under $2k.  At worst it'll be, "Act in haste, shop in leisure."

I do have a daughter who is ready for her first bike, but the Cabbage isn't right for her.  She wants a Nighthawk 250 and I'll find one around at a good price I think.

I've given a lot of thought to everything you guys have given me to think over and I've come to the conclusion that there is a person out there who really wants a Savage.  Maybe he wants to cafe or bob her, or maybe he wants to ride it as it is.  Whatever the case there is another more eager person out there just waiting to love this bike.  I will sell her.  I'll put her up on ebay with a starting bid of $1000 with no reserve and may the best man (or woman) win.