HP/Compaq :: Wireless And Graphics (and Coupons...)

Wireless G and Wireless N. What is the difference? I know that N supports faster speeds and have heard that it's likely going to become more of a standard in the future. My question is, will it work like any other wireless device? I don't want to get it and find out it needs some sort of special connection.

Also, graphics cards. I see a whole lot of debate about this here, and not really a 100% clear answer to anything. I'll be using Photoshop and other digital art programs, and running Windows 7. I don't do serious computer gaming, and the most 3D-intensive game I might ever run would be something like the Sims- and that's an "if".

Would dedicated graphics have any significant advantage for me? I've been configuring with the Intel, but I don't want to sell myself short and regret it later, especially with something that can't be changed.

On the other hand, it's also important to me to have a cool-running computer, so if the added heat and power consumption will outweigh the benefits it'll probably be a deal breaker.