Kit makers are having a hard time and hobby shops that stock kits are few and far between and the two are closely inter- connected, but the Four Star would be worth the chase. I had a Four Star 40 for eleven years and without a doubt, it was the best sports aerobatic I've ever had.
All reports suggest the 20 version is equally as good, though it has the odd quirk - the bottom battery hatch location is strange, for one. As much as I try and stay away from kits - mostly, I design my own models - I can see the future if I ever come across a 4*20 kit...
Just go ahead and order one from Sig. I've mail-ordered from them several times and they are good to buy from