Both options are only good for re-sale to those who think they make a difference. Audio gear is anything but an investment unless you are buying McIntosh electronics - which are often collected.
While I agree in this application cast baskets are only different in appearance its the difference I consider to be the investment.
Put 2 M80's side by side. One with cast baskets one with stamped. Now pick one...oh wait that ones a few bucks more....but...I want it. It looks cool and I feel slightly happier with them than I would otherwise.
I don't get the opposition. I couldn't justify spending the $1500 without them looking as good as possible.
Just my opinion.