I've been keeping an eye on both your sites and I have not seen this infection return, so I think you are both clean and safe now. I think that last back-door I found was the last threat and the only way those hackers were able to keep re-infecting your site. I am marking this topic as "resolved", but please let me know if either of you find anything new or need any more help with this.
Thanks to both of you for letting me into your site to find this new threat so I could add it to my definition updates. And thanks for your donations too ;-)
Aloha, Eli