I run 5Zigen Fighters in the Titanium finish, which is a coolish bronzy gunmetal color, on my Adriatic Blue Pearl DC4. IMO, the silver finish is a little bright for the darker greens.
I'm having trouble remembering how bright the green hue is on Isle Green. Is it fairly dark? If so, I say go with the darker finsh.
As far as quality, I love them. They've held up just fine, and to answer your question...5Zigen has been the wheel biz for quite a while..
That said, the Rota Slipstreams are also very sturdy and rather lightweight too, considering the price. Either brand is a wise choice IMO.
My 2.3¥