I'm with you- I think these little racks are fantastic. Though I think a decaleur is a wise idea if the bar/rando bag one of these is supporting will be carrying anything significant! Dia-Compe make one (left in the photo below)- it's somehow slightly less elegant than the TA/French ones, but it does have the advantage of the center support going over-and-above the brake caliper, rather than underneath it (I had to do some subtle dimpling to get the rack/fender/fork-crown arrangement to work when I put a TA rack on my fendered PX-10).
No idea what the brand of the rack on the right in the photo below is- it was on eBay labeled as a TA rack, and it was cheap, so I snapped it up. The proportions are a little deceptive in the photo- the Dia-Compe rack is actually pretty small- the square-ish one is more or less the size of the classic TA racks- maybe just a tad bigger.
I always keep my eye out for the occasional bargain on these racks.