The gaming laptop is a more retarded idea than the netbook. (Which actually has a use in practice)
Gaming laptops are absurdly heavy, and get poor battery life. They cannot handle the heat, and live a short life. Their GPUs are limited in capablity, and soldered on, so their useful lifespan as a gaming machine is generally only 1-2 years, tops. As opposed to a gaming tower, where a simple card upgrade can often keep the same machine on the field for 3-4 years, or more (provided the owner was thinking ahead when choosing a CPU)
Yes, the 9600M GT is slower than the 8800M GTX. The desktop 8800 GT is also faster than the desktop 9600 GT (a bit step up from the mobile 9600, I might add). For someone who supposedly cares about PC gaming, I find it odd you didn't know that. It shows you don't read benchmarks (Tom's Hardware has a great monthly feature for this), nor do you know about the numbering schemes ATI and Nvidia use for their designs.
As for the MBP...
I want a computer that is actually mobile. The MBP is meant as a compromise; something that has enough power and expansion to do professional work on the go/in the field, yet is still portable enough to get out there in the first place. If you wanted performance, but didn't really care about portability, get the Mac Pro.
OP, if you want a gaming machine, go build yourself a tower, and slap Vista Home Premium x64 on there. There are many people willing to help you, including myself and others in this thread. Go over the general discussion board and start up a thread asking advice. There are many other communities to help you as well.
-Summer Glau