FWIW, my list of steroid era guys in the order I'd put them in the Hall, is:
1. Roger Clemens
2. Greg Maddux
3. Randy Johnson
4. Mariano Rivera
5. Pedro Martinez
6. Trevor Hoffman
7. Billy Wagner *********
8. Tom Glavine
9. Mike Mussina
10. Curt Schilling
He doesn't appear to be on track to end his career on a high note, but Johan Santana has the potential to bypass everybody below Pedro. Through his age 33 season he's thrown 2000 innings with a 136 ERA+; by contrast, at that age Maddux was 3000,144, but Glavine was only 2650, 120, and Moose was 2450, 129. So at least in terms of quality Johan trumps Glavine or Mussina at his age, and he's not so far behind in terms of quantity that he can't bridge the gap.
The cutoff is somewhere right in the middle of Billy Wagner. I'm right on the fence for him. BBR's requirement to qualify for career ERA+ is 1000 innings; Wagner is barely over 900 career IP. But if he did qualify, he'd beat out everybody but Mo. And he did save 400+ games. Granted, many saves don't mean a whole lot more than wins do. But counting stats can matter; see below.