Just bought the fibur and a SS kit as well, can't wait for them! I went with SS because they apparently are more sturdy, as well as they do not shrink / expand due to weather as Al does. Also SS I have read has a smoother finish and in theory will give a better shot. For $35 extra compared to Al brand new for the kits I went with it... Can only be better than Al excluding weight.
ICD Promaster x2
JOLE Cocker #13, soon