If I were in your shoes.....
Go buy the JD Skid Steer Adatptor for the 400cx Loader (it was in the 300.00 ballpark for my 300cx) and surf around for a set of Skid Steer forks...
I had priced out a set of Brand New Bobcat forks....Carriage w/Brick Guard, and 48" 5500lb forks for $700.00 cash & carry at my local bobcat dealer...that was just by calling them, the exact words were "we got PLENTY, head on down and we'll talk" which I translated to "if you come in person with some greenbacks we can prolly do a little better"...
Ended up picking up a complete set of 5500 lb Caterpillar forks for $400.00
IMO going with the skid steer QA opens up the doors for cheaper attachments. If your not in a rush you can ALWAYS find buckets, forks, grapples, etc.. for relatively cheap on Craigslist....Thats why I had my tractor delivered with the SS QA from the get go and I've been VERY happy I did.
Another bonus with the Skid Steer attachments is If for any reason you ever change brand or upgrade/downsize tractors, pretty much most if not all the MFG's these days offer a Skid Steer QA....so all those attachments you've picked up along the way like Forks, Grapples, Rock Buckets, etc.. would all work on your new Kubota, New Holland, Massey, etc...