He peaked at 122 IMO, and I thought his best performance there was between Cruz or Castro. At 126 Robinson and Johnson are good mentions IMO. He was hit a lot by Bungu, but the result was an excellent showing off his power.
In his championship career I think Robinson and Bungu are the two standouts. I don't rate his performance against Johnson quite as highly as others - would put it in the same bracket as his win against Vazquez. Fantastic showing of his power and his ability to make usually aggressive fighters look gun shy, but lacking the body shots, combinations and accuracy of those other two fights. Against Robinson and Bungu he was putting threes and fours together, going to the body, wasn't loading up and swinging as wildly and was just more alert and sharp all-round.