If you want to deal with the hassle, then you can sell it yourself.
Bitcoin has a mechanism that specifically blocks moore's law, and algorithmic optimizations. As the computers on the network get faster (i.e. the total speed that bitcoins are being mined increases) then the problem that has to be solved to create a bitcoin becomes harder. Read more
I don't think you'll need two video cards. Just spend the money on a higher quality single card. You should be able to get a 7950 for around same price.
Just practice, practice, practice. Download a book from http://www.gutenberg.org/, and type it.
Compatibility overhead should only affect throughput (e.g. downloading large), and not (significantly) affect ping times. So if you're mostly concerned with playing online games, or browsing media-light websites, mixed mode will be fine. Read more
Not only is it okay to correct someone posting that kind of information, it's absolutely the right thing to do. It could get someone killed.
Try to come up with some minimalist deco. That way the emptiness looks deliberate.
Toshiba and Asus have great track records. I've been leaning more towards Toshiba while shopping for my new laptop, since Asus hasn't been shipping any descent AMD laptops.
Errrm... IANAL, but I'm pretty sure there is a term for this, and it's called "return fraud".