Honestly, can't really answer your question without knowing how you cook and what kind of parties you have. I mean, if you don't entertain and are only cooking for two, the RK would be serious overkill. Still cool to have, but not very practical. A small get together for me is somewhere between 10 and 20 ppl. Probably have 6 or 8 or those a year. A medium sized get together would be 20 to 40, probably have a half dozen of those as well. Lastly, there are the larger parties of 50 or more. Probably have 4 or 5 of those per year.
I generally offer a variety of proteins for any party, so the RK gets a full workout on small and medium sized parties, often times the Mini RK gets used as well. For the large ones, I borrow back the RK that I gave to my brother and sil and cook on both of them. For the really big parties, it's both RKs and the miniRK, with meats coming out of my smokers as well.
Having 2 RKs is a luxury, but I've only got about $600 invested in the both of them, so it was a no brainer each time.
So, what kind of parties/cookouts do you have ? How frequent ? What do you cook for them ? And lastly, how much is the RK ? Cause if it's under $200, none of the above matters, you should get it.