Sorry I can't be more help in regards to configuring PPPoE. I have never worked with it and don't know much about it. You could try another distro, maybe Fedora or CentOS. I have heard good things about both in general but nothing about its compatibility with PPPoE.
As for what router to choose, generally any wireless router you get is going to work fine. The problem many linux users run into with wireless networking is the lack of drivers for some wireless cards in laptops namely Broadcom. The support for these wireless cards has improved recently and my wireless card has gone from no support in 7.10 to plug and play in 8.10.
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