If it's the look you like, go for it!
I personally never worry about resale when I do anything to my SVX because A) I hope to NEVER sell it and B) No matter what, currently and for the foreseeable future, there isn't really a collector's market for the SVX in a way that a nice stock one will be worth a ton more money than a nice modified one. Maybe someday, or maybe not. ENJOY the car now for what it is and do what you want to do with it, don't treat it as an investment or your kid's college fund because it probably won't turn out that way.
That said, judging by past sales and interest, I'd say if the paint job is well done and high quality and looks as good as you say it does, you would have no trouble selling it for just as much as a stock color repaint, maybe even more. In the past custom-colored SVXes in dramatically different colors like yellow have sold faster and for more $$ specifically because they WERE a custom color.