I bought a BTTL st28h-6 Mini skid steer. Incredibly well made. I love the thing but it has some design flaws. The biggest being the track design. It is flat instead of triangular. Most of the commercial mini skids are triangular with the drive sprocket at the top of the triangle which keeps the drive sprocket out of the dirt/rocks. Very important. I have had problems jamming the tracks turning in soft dirt and gravel. The debris get between the drive sprocket and the tracks which force the whole floating frame to jam against the body and stopping the drive sprockets. Then you have the loosen the track tension and clear the jam. Other than that I love the thing and use it all the time to unload and stack hay and move my engine welder around. It fits in very small spaces that I can't get my tractor. I bought a set of pallet forks and 4 in 1 bucket, works great.
The other thing to watch for is on hills. It has a very short wheel base and is unstable on steep slopes. It almost killed me unloading it when I brought it home. My fault of course. They loaded it on the pallet on the back of my flatbed truck facing forward. I went to back it off the pallet down a steep ramp without the bucket mounted so it was VERY back heavy. As soon as I hit the ramp, the whole thing flipped over on top of me. God was watching out for me once again and I ended up on the ground with the mini skid on its side, resting on my foot. Don't do this! So it has it's limitations but it is incredibly useful. Also their customer support is great, when I flipped it it destroyed the pilot controls, lights and throttle on the top. They sold me all the parts to repair it and talked me through all of my problems.
As far as lifting 700lbs, although as D'oh said, if you put enough weights on the back it would pick it up, but I would chose a full size skid steer. I pick up a pallet with 4-6 bags of concrete at a time and my forks weigh 300lbs. I think there are lighter forks out there.