How would you rank them? (Scroll through the thread for more rankings by other users, the following is only my opinion and a list of probably available SGs)
1. Courtney Lee
Is both a good prospect and a ready contributor. Likes Doc and will come slightly cheaper. Fit and has talent. Need more be said?
2. Brandon Rush
Had a great season. Love his game. Young, athletic, plays defense. Can defend the 3 as well. Can shoot as well. Only problem is whether he is attainable (like Lee).
3. Leandro Barbosa, Delonte West and Ronnie Brewer
Barbosa is one of the better/best targets who has stayed relatively healthy. The Brazilian connection with Fab helps. But skills overlap with Terry, is undersized again and he's on the slightly older side. Oh, and no defense. Price is a question again. But I'd be glad to have him here.
Delonte is Delonte. Great scoring guard, hound on defense. But is a bit of a headcase (must stress is a very minor issue as of recently) and perhaps some resentment from being let go by Danny last time.
Brewer is surprisingly not mentioned much here. Good defender, athletic, young-ish kind of like Rush. Can also defend both wings. But is a subpar scorer and can't create. The scoring part is not a problem, though, as he can feed off our core. (Seems I've vastly overrated him though).
4. CJ Miles
CJ Miles is younger. Less of the defensive behemoth (still decent though) that Brewer is apparently but more versatile on offense (sources are NBA 2k12 and google so please correct if wrong).
5. Pietrus
Might be overpriced, especially for an older option. Hence the lower ranking. But I really love the guy.
6. Randy Foye and Anthony Morrow
Younger and healthier than Pietrus but is more one dimensional and smaller. He showed up big in the playoffs though.
Anthony Morrow would be higher if we could trade picks for him (this is unknown at the moment). Like Foye, he is one dimensional (maybe even more so with his meh defense) but he can...flat. Out. Shoot (he has an edge against Foye in my opinion but if we have to trade a player for him it's a knock against him).
7. Josh Childress
Injury prone and less of a defensive player than Pietrus. Being bigger (6'

and younger than Rip Hamilton helps though.
8. Martell Webster and Rip Hamilton
Webster is unproven (but has at least stuck around in the league) and, as others have said, a slight bit too much of a project. Rip Hamilton is old and apparently has health problems. Both are risky.
9. James Anderson, Dionte Christmas and Terrence Williams
None are proven. Terrence Williams's ceiling is higher and is a better player but his work ethic has been pulled into question. If we grab any of them I'd hope it's because we're getting them as more insurance and as projects. I'd be a bit sad if they were our only backups (but not the end of the world).
Off the market:
Lou Williams (Hawks) - Would have been nice for the money
Gerald Green (Pacers)
Dahntay Jones (Mavs)
OJ Mayo (Mavs)