I like the changes.
The only thing that I might suggest is that there be an option somewhere in profile settings (preferences maybe?) that would allow you to display the current AP of a different account as long as the correct password was provided. Something like the option in a lot of email services where you can receive mail from other addresses.
The reason that I suggest this is that I, like I'm sure many other of the more prolific community members do, post and purchase with two different accounts. It would be nice to have that number display the current AP balance on my actual AP account.
I don't however think it would be a good idea to allow billing to be done from a different account, for security purposes. If someone hacks my account, they can post things and change things on my profile, that's not so bad, but I would not want them to be able to spend my AP.
Just a suggestion