To expand on my above post - when I first got my JD790 (like to call it that because everyone thinks that I have one of the big hoes, and to be its my big hoe, better than a shovel) I had no weight on the back, and no tooth bar, really had trouble digging, wheels would spin very easily when trying to dig. Could only skim off the dirt in thin layers. Got a tooth bar and it helped the digging, but the wheels would spin easily. Purchased a Bush Hog 5' box blade, about 490 pounds, added it to the 3 point, really made a difference. Also found I needed weight for keeping the rear wheels on the ground with a bucket of wet dirt or manure. Later purchased a Bush Hog 7' scraper blade, tried it, found it to bulky hanging out back, but it did about as good as the box blade. Purchased a Worksaver Fork attachment this summer, found the box blade was not enough when lifting at full capacity of the loader, so I loaded my rear wheels (R4's) with 5 gallons of methanol and 28 gallons of water each, giving me about 260 pounds in each tire. This is great, sorry I didn't load at the start - able to dig with out the box blade, and with the blade this thing really hugs the ground and will cut more than it can move. So my recommendation is load your rear tires, then look at implements with weight that will also be of some use to you.
By the way it only cost me $14 for the tool at NAPA (adapts garden hose to valve stem) and $40 for the methanol to load my rear tires. Cheaper than any implement.