Any of the FP green/red/black would be a good replacement and they are sale right now, plumbed exactly like any MHI turbo and are robust.

I had an old SCM5031 and the FP spools faster and have more top end, personally I wouldn't bother with rebuilding it unless the price was very decent, I know some rebuilders won't even touch those turbos as they are very common for thrust bearing failure.

I run two -6an lines from the VC to my can and a -8an from the can to the intake pipe, can collects quite a lot of crud, oil never smells gassy or given me any issues.