I believe the lift capacities of the LA402 are greatly under rated.
I recently picked up (with the FEL) a 800lb backhoe with a 230lb operator and i was using a 100lb skid steer qa adapter on my B7800 LA402 (with counter weight). I really didn't think I was gonna be able to lift it, but I did w/o any real struggle. I think the La402 could easily lift 1300-1500lbs when they report only 1000 lb capacity, much closer to what they list as breakout force.
What all this means, is unless you need to dump a load at full height, like over the side of a pickup or dump truck, you could probably run a 300-500 lb 4n1 and still have 1000lbs of lift capacity.