Anderson has been great. If Spurs do a trade for a SF, it should be a little trade and not a big one because it will create a logjam if Spurs add a too good players.
I think Spurs should follow three rules if they try to do a trade for a SF:
1) Don't trade a first round pick. Second rounds picks, De Colo's rights and cash are the only incentives that can be added.
2) Bonner, Neal and RJ can't be traded right now. I don't want Spurs to trade Duncan, Parker, Ginobili, Dice, Blair, Hill, Splitter or Anderson for a SF. Gee or a TE is the only thing that can be used to match salaries.
3) Don't go over the tax.
1) implies that the player must be in the doghouse with his team.
2) implies that the player salary must be lower than $1,052,743 (125%+100k of Gee's salary).
3) implies quite nothing once 2) is respected.
I've suggested Donte Greene or Sam Young in an other thread because their salary is low enough to fit 2) and it's possible (I didn't say likely) that Spurs could get without giving a first round pick. I don't have look at all the teams but there are surely other names to throw in the conversation.
Rush isn't at all a realistic option to me since his salary is too high.