El-nikkor is the way to go. I have both the componon and the el-nikkor lenses.
Here's the bottom line. I think/know that some of the Schneider lenses are crap.
Not all mind you because I have an 80mm and a 100mm that work just fine. But I had 2 of the 150mm lenses and they both stunk. As in worse and worser. Make sure you can get your money back on the lens. Now I use a Rodenstock Apo150mm lens that is just incredible. It also cost me about $1200 new. With ebay around one doesn't need to spend this kind of money any more. I have only one el-nikkor lens in a 210mm variety and it works extremely well. I'm sure you'll get alot of feedback on this thread....
Best, Peter