Ah, that's unfortunate. I have heard about some issues, but I thought they were only with dual monitors. My drivers crash every once in a while, but it's not too big of an issue.
I've heard the Mamba is really nice, but the Deathadder/Lachesis are wonderful mice as well. Haven't tried any Logitech mice, but Razer does make good ones.
QFT. I loved how you could immerse yourself in the HL2 games... with a coop partner you're just going to have someone screaming in your ear the whole time.
Do exactly what Demon said. Just make sure you say "one" when they ask how many computers were/are activated with this code. They don't actually check or anything, they just accept your word.
I'd just get an iPad to be honest. You'll be happier with it when you can do more. The only unfortunate thing is you can't go shopping for books wherever you go unless you want to pay for the 3G. For PDFs I feel you're going to get more of what you want with the iPad as well.
The H50 isn't a miracle worker. You will still see temps in 50s/60s (especially if you OC) under load. However, you may want to try reseating the heatsink, that tends to help. Also, give it a bit of time. Your TIM might have some curing time, so temps could be dropping as you read this.