[quote name='electronicthroat']I'd love to sell you my copy (I actually have it on my buy/trade list), but from what I've read, it is a hassle to switch the serial number to another account.[/quote]
It's not a hassle, it's impossible. Valve does not switch stuff around, at all. Once it's in an account, it stays there. They also ban accounts that have been sold, so that doesn't work either.