Congratulations, although I have never heard the RSL's I have been around the forums long enough to know they are a great speaker for their budget.
I just wanted to offer a counterpoint (not that I believe there is a right or a wrong way - having your choice is the right way!).
I have several pairs of speakers aside from my HT system. But for the sake of simple example, I will focus on 3 of them to explain my rationale.
My most used speakers (and ironically the "worst" of these 3) is the JBL LSR305. I use them the most because they are connected to my Amazon Dot and I have a 3 years mature Pandora account (with a deep history of "thumbs up/down"!) and I am lazy so I opt for the convenience of telling Alexa to play Pandora and get an endless stream of music I enjoy with out further effort. Like I said the JBL's are far from my best speakers, but they are still very good and the wave guide they use renders "sweet spot" an obsolete concept - I can be anywhere I reasonably would be in the room and enjoy them. SO they give me effortless good sound. Primarily background music, but still good enough to enjoy when mood/song attracts my attention to the music.
Second, I currently have Philharmonic BMR's hooked up for attentively listening to music. These have an extremely flat and clean response and amazing off-axis response. Certainly a high quality speaker that does everything very well.
Third, I have a pair of Martin Logan electrostatic speakers for attentive listening to music. If you have ever listened to electrostatics, you will understand when I say these have a substantially different sound without sounding wrong. The sweet spot is narrow compared to the others, but it gives a different presentation to the music I am extremely familiar with, making it "new" and, for me, that is fun!
I would not want any one of these three speakers to be the only speakers I listen to.
The JBL's ($300) are special purpose for having an "all-encompassing" sweet spot.
The BMR's ($1350) offer a simply great all-around speaker at a very good price!
The Martin-Logans (which I bought used for $1600) offer a substantial degree of variety (without compromising SQ).
Having listened to a lot of excellent speakers I have concluded there are a lot of excellent speakers!
Although they definitely all sound different (different speakers do that),I often have a hard time concluding that one is decisively better than the next.
So, if I'm to have more than one system, they will not use the same speakers. Variety is the spice of life!
Some factors that probably helped us take different paths is:
1) I make it a hobby to listen to different speakers so I have the exposure to find multiple excellent speakers that sound different but still meet my audio preferences.
2) There are not so many good sounding speakers in the price range of the RSL's as there are in the $600 - $1500/pair price range I mostly dabble in. Looking at the speakers I have heard that I think would perform on par with the RSL's are the Philharmonic Affordable Accuracy ($200/pair but you pay return shipping if you don't like). Infinity R162 ($330/pr IIRC, but these were on clearance - I doubt you'd ever find that deal again). EMPtek 41Be (300/pr IIRC) - I think there is a used pair available in classified for $200, but these are desktop speakers (SPL limited) as suggested by the 4" woofer. Although I believe the RSL's have a smaller woofer as well, I think the RSL's play louder as part of a sub-sat style system.
So you can see, as compared to the RSL I had to qualify every alternate suggestion, with the AA's coming closest (you have to risk the cost of return shipping). The AA's put out the kind of bass the RSL speaker's smaller woofer could not, so especially if you are ever looking for a simple 2.0 system (no sub) they would then represent a much better deal than the RSL's.
In any case, that is my take on whether to replicate or vary speakers.