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If you want to save a few bucks (Like about $410!) here is a link to plans for building one out of PVC. I just built mine this past weekend for about $60 total in parts @ Lowes (I also bought wheel casters for about $5 more than the original plans, and used screws to hold it together so it can be disassembled/packaged for storage while I'm stationed in Korea).
As folks on the thread can attest, it is VERY stable and having the casters (I bolted them to the 4 plugs on the feet) means I can easily move it if needed. Another suggestion is to buy a pool noodle (the big foam tubes) to put across the front of the hardtop that rests on the legs. I cut a slit along the side of it, and the noodle slipped easily on the front of the top, saving any wear and rubbing.
I can post pics of the top with the noodle mod if you're interested. All in all it was a quick project that took about 30-45 minutes to make. The material's list shows 26 feet of the 2" tubing - I had to buy three 10 foot tubes, so make sure you have a truck or SUV to haul them home Good luck!!
If you want to save a few bucks (Like about $410!) here is a link to plans for building one out of PVC. I just built mine this past weekend for about $60 total in parts @ Lowes (I also bought wheel casters for about $5 more than the original plans, and used screws to hold it together so it can be disassembled/packaged for storage while I'm stationed in Korea). 
Good luck!!