Since we're on the topic of track wheels for Lin, does anyone have experience with Apex? They're cast (but not gravity cast, think they're "flow formed"), lightweight, and reasonably priced. Certainly < forged, but you can probably replace three of these for what a forged wheel will cost....(~325/wheel for 18x10 @~20 lbs).
If you don't want to beat up your nice street wheels and want something for the track they seem like they might fit the bill. Or maybe not.