Dave,
I have the JD fork attachement for my 4310 w/ 420 loader. Same one fits the 430.
It is a little pricey, however, I couldn't find any off the shelf forks that quick attach in place of the bucket. I didn't want bucket mounted forks, you can't see the forks because of the bucket, and you can't pick up near as much weight.
I use mine a lot. So far no complaints at all.
When I need both the bucket and the forks on a job, I mount the forks, then bick up the bucket and strap it on to the forks, load the tractor and away I go. Real quick and easy to change. Its also nice to load the box blade in front of the tractor, and leave the backhoe on, then I can take everything I need to do a foundation in one trip.
For me, the shock of the initial cost, has been well offset by the amount of use I've found for these forks. Well worth the money.
If you have any questions I can try and answer, feel free to e-mail me.
DT
dltimmons@sprintmail.com