The SKater was a fairly flexy and narrow outline G10 fin, right? So for a two fin quiver, I reckon either Drake 22+24 or MFC K1 21.5+23 (my feeling is that the K1 generated a bit more lift per size, but you may want to check with Kevin or MFC).
I wouldn't worry too much about polyester or G10. In the MFC program, I would surely go for the G10 K1 for the Kode. And regarding Drakes, the new polysester is tad softer but a tad thicker and generates around as much power as late generation G10s. Early generation Drake Natural G10 were very, very soft though, and sailed smaller relative their size (but oh so sweet - as light weight sailor those early ones are still my fav single fins).