I had played that limited edition SK-3 sometime ago and it is my only colour choice besides black which I liked. Such a beauty. Lovely mellow tone. I recalled i was told it is about 3x the price of the standard ones.SK-3
According to much reading here, you'll very likely advised not to get piano which you didn' try.
Sharing a short story. A while ago, my teacher upgraded her grand. After testing many piano at different showrooms, She tired a particular brand and model at this showroom. She liked it but wanted it in white which there isn't one for her. She ordered and got her piano after weeks.
Does she likes it? No. Does she love it? Yes.
PS: My teacher is a very advanced pianist with over 20 years of teaching experience. Still actively being one of the judges of many local and overseas competitions. A former piano books author.
If you settled for any piano except your ultimate choice (SK-7), would you possibly (after a while) miss it and regret not getting it at the first place?
Personally, I do not like the idea of getting something for now and upgrade it later especially I have the budget and choices.
When someone tell you they found their dream piano, he could have tried a handful of pianos and only out of those, that is the best. If he continued to hunt, a newer dream piano would probably appear. That's no real end to it.
Good luck and sorry if im not helpful. Let us know your final decision.