The Streamliner comes in a version that goes on the quick release and with an attachment to the caliper brake mounting. It is called the Axiom Streamliner Road Rack. It is on the same site where you sourced your picture.

It in fact looks to be sseveral solutions in one for people who want to ride bikes with short chainstays and suffer from heel-strike on their panniers -- it provides some degree of setback compared with other racks -- and for those without braze-ons on either the drop-outs or seat stays.

The Topeak Super Tourist DX Pannier Rack rack is robust. I have several and they do the job very well. I particularly like the extrusion on the top that ostensibly is designed to as a track for the Topeak rack trunks, but also works very well as a work bench. Plus, having toured with a rack without that flat top plate, I found my tent bag rubbing through from the rack stays and the platform seems to combat that problem.

As to getting a silver rack... spray paint it with silver? When my black racks start to look a bit ragged, I just get the matt black spray can out and give them a going over. Or if you have the time and patience with an alloy rack, rub off the black with steel wool and polish it up.