Got a couple of sets of Tektro RX20G for $15/pair when Nashbar was clearancing them out. They look practically identical to the previous generation Shimano Ultegra 6500 brakesets I have, but the RX20G have orbital adjustment, while the 6500 Ultegra do not.

I put one set on my backup bike. They felt stiff enough allright, but stopping distance was rather disappointing. I happen to have a set of KoolStop pads so I swapped them in, which made a significant improvement. I was a bit perturbed that the Koolstops cost as much as the brakeset. But then again, good brakes for $30 ain't too shabby.