Trouble is, fotografica, steroids do none of these things.
As I think I've said here before, I've always thought his symptoms were more like HGH than steroids. (Even intense workouts don't make your skull bigger, for example.) But there's no test for it, so it's even more speculative than the other allegations.
Broxton does look great as well, maybe the closer of the future. I'm not as sold on Saito repeating what he did last year as most Dodger fans are (of course, he really doesn't qualify as a "young" arm,) but he is a better bet than Benitez. If you want to be jealous of pitching prospects, however,
I think that between Saito and Broxton, the closer spot will be OK, although you're right that it's doubtful Saito will be that good again. I don't think he put up numbers like that in Japan and he's in his mid- to late-30s. Everything points to a fluke year. The middle relief doesn't look great per se, but there are so many potential starters that whoever trickles down to the relief corps can't be too terrible. OK, forget I put that in writing.
You're right though, Benitez is too inconsistent to have confidence in. And he's been like that for years. One game he'll blow away every hitter he sees, the next, you wonder how he made it to the majors. The truth is there just aren't many strong closers and there never have been. That's the why the few guys out there are superstars.
Who do you suggest would fill his shoes and perform better on the field in 2007? Any trade for a player remotely qualified (Manny, Andruw Jones, etc.) would cost the Giants too much in young pitching. Much better for the team to play Bonds this year, and make a run for Jones next year when he is a free agent. After that they begin to have some young players in the lower minors who look like prize prospects who may well contribute.
That's one thing that's pretty clear whether or not you like Bonds or the Giants: The Giants have hitched their wagon directly to him since 1993. That's paid off in a new stadium, high attendance, more revenue, and playoff appearances. It's hurt them the last few years in bad PR, clubhouse discord, his injuries, and payroll. At some point it kind of snowballed, and now each has become the other's main (or only) option. You hear a lot of people saying the Giants should dump him, but that's hard for them to do for reasons beyond his production.