Perhaps DeLay is being targeted more-so than other representatives, but it seems as if he is the most critical offender.
DeLay paid his wife and daughter $500,000. According to the links you gave, DeLay is the greatest offender by several hundred thousand dollars. The closest Rep. cited is
"Rep. Jerry Lewis, R-Calif.: Wife Arlene Willis serves as congressional chief of staff at a salary of nearly $111,000."
"Weldon said he had first-hand knowledge of the effectiveness of DeLay\'s daughter, Danielle DeLay Ferro. He said that Ferro had done yeoman\'s work in helping to bring her father to a Weldon fundraising event in Orlando last year."
Ohhhh wow! She brought her daddy to a fundraising event in Orlando!
I realize this is going on elsewhere, but if the government cracks down on DeLay, it will at least show other representatives, especially high-ranking representatives, that our government sees this sort of behavior as unacceptable.