I expect you'll see a number of recommendations to go with aluminum main caps, instead of steel or ductile iron. I like the BCR caps, although I don't recall them being available when I had a different brand of aluminum caps installed on my "next build" block.

Lots of different opinions on the benefits of using a girdle, too. I think the combination of aluminum caps and a girdle makes sense, but not everyone will agree with me on that.