I have a JD 4200 with a 60" First Choice box blade and it works great. I only paid $285 for it and it's way heavier and better built than the King Kutter. The finish on it is incredible. They use a powder coat paint and you can get it in JD green, too. /w3tcompact/icons/smile.gif
If you're looking at KK, you really owe it to yourself to check out First Choice. I just saw an area dealer advertising the same 60" model I have at the same $285 I paid. I don't remember what the 48" model pricing was, but I'm sure it was notably lower.
If you'd like to read about mine and see some pictures of it here is a <A target="_blank" HREF=http://www.tractorbynet.com/cgi-bin/compact/showflat.pl?Cat=&Board=implement&Number=163675&page=&view=&sb=&o=&vc=1>thread</A> about it. I think you'll be impressed with the quality, fit and finish of the First Choice product. I took some pretty detailed pictures so you can see how it's put together.
If their landscape rake is anything like their box blade, you might want to consider a matched set (in JD green, of course). /w3tcompact/icons/smile.gif I hope this helps.