What a wonderful dilemma to have. Your question really started making my thoughts stir

. So while you are the only one who can make that decision, and what i say should not have any bearing to your decision, let me tell you what I would do. I feel i base my judgement on my finances, and return of enjoyment for the dollars i spend since it is a limited resource. So here goes:
5. cost 20k
choice: rs + f3.
reason: I think this is the worst of choices. Your rs gives you pleasure say you can rank it 8/10. Your F3 say will give you a 10/10. But I feel you cannot add these together as once you buy your F3 the rs will give you diminishing satisfaction. so your satisfaction will not add to 18/10. You will get perhaps only 13/10. So for the $$/satisfaction, this would be pretty much off my chart. you will not ride your rs, you will be on your new beauty. plus paying double insurance. bad choice in my book.
4. cost 0
choice: only rs
I figured I would keep this an option. Its not a bad one. you spent nothing, you have been happy, nothing wrong with that. cost is still 0. if it aint broke dont fix it. And you got the most value for your dollar. satisfaction level 8/10. nice life!
3. cost 34k
choice: f3 + slingshot
reason: OK, i know im throwing in a monkey wrench here. But hear me out. One option for me would be to sell the rs and get an f3, and slingshot. I mean think about it. You have two separate toys, separate excitement. One butt, two toys. What a great life. Ok assume that the slingshot is not as desirable as the F3, so lets give it a 9.5/10 satisfaction level, so i spent 34k (-6k for selling the rs) and i got 19.5/10 satisfaction. not a bad option, but a bit pricey.
2. cost 14k
choice: only F3
reason: So i figure if you went to sell your RS you will get around 6k for it. I have a 2008 rs with 12k and i probably feel i would get about the same. So you sell the RS, buy the F3. your satisfaction level will be a 10/10 and you spent 14k, i think that is good satisfaction/$$$ . And this would and could be a very real situation for me.
#1. cost 20k
choice: rs + slingshot
reason: Ok so i know I might get slack for this. But if i think about it, the F3 looks so nice, i really like it. But if i want the most satisfaction for me $$$, i would go for the slingshot now. It is not that i like the slingshot more then the F3. In fact I do not, i rather have the F3 over the slingshot. But i already have the RS. And while the F3 is wonderful, the $$$ I spend for a slingshot will give me much more return. Say i have an 8/10 with my spyder as i have had it for a while and say the F3, gives me a 9.5/10 as its the new toy (but not a 10/10 like the f3 might give me), this would give me a great 17.5/10 satisfaction level. That is great satisfaction level to me and not bad coin spent....
I would only make any of these decisions if i have cash up front. i would not make any of these decisions if i had to finance it.
man,, you have a great decision to make on your hands. Have fun deciding. (btw you were the one selling the soft hangrips at spyderquest right? sorry i didnt get em

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Fas