What do you mean "loader ready"? Do you mean it's got the mid SCV's?
Either way, I don't like putting aftermarket loaders or backhoes on tractors, they just aren't made for one another and will not be as powerful or last as long. I believe you can get the newest 300X/CX for them.
When I was doing my research before I bought a 790 two years ago, I checked on Deere, Bush Hog & Koyker loaders. There really wasn't much price difference between the three. So if had needed to, I would have gone with JD.
I ended up finding an '04 790 w/300 loader. ~~ grnspot
I would personally recomend a Deere loader myself.
The size loader you want is in pretty high demand, and will be hard to come by used. You can hope to get lucky and find a 300 series (300, 300x,300cx) used or you can look for a 430. Either way you will also need brackets for your series tractor. Chances are the 430 will already come with brackets for your 4x00/4x10 series tractor (but was also commonly found on the 4005, 790, 990's and so on) but the 300 series could be hit or miss as they are more often found on newer series tractors. You can by the brackets separate from Deere, but they are probably around 1,000$.