If you don't like the patina that all the mild steel racks develop, but want something posher than the standard aluminium offering, have a took at Tubus's titanium and stainless steel versions. The Ti ones were always expensive but now ridiculously so, I notice the range has shrunk, maybe they've priced themselves out of the market. Could be a rack for life though, my 9yo one still looks like new. I also had a SS Cosmo for a few years and the finish was a better match for a ti frame than the ti one! I part exchanged that for a ti Logo, the owner didn't like it because of the narrow top mickeg mentions. If that suits you anyway, they're currently on sale with the SS version not much more than the mild steel one. There are a few other ti and SS racks, but I've rarely seen one.
I also like the lower rail, it's not just lower, you can also put the pannier further back and the extra frame protects a rear light. My small Ortlieb rollers don't really need the frame to keep them out of the spokes, but I've had some panniers that do.
As mickeg says Tubus maximum weights have changed, but the website says which have been tested to 40kg, not all retailers have caught up, SJS have the Cosmos at 26kg and the Logo at 40kg, but on the Tubus website they're the same.
EDIT
the Rivendell\Nitto 'Big Back Rack'.
I've just had a look at that, it's a thing of beauty, as it should be for the price, but it doesn't fit in the normal way so it'll look a bodge.