Doors...what type of gaming or shit? I mean I can get away with only 4gb of ram easily since I don't do anything extreme. I use photoshop rarely, and MIRC + IE + minecraft + age of empires...
If you have questions about specific hardware and whatnot,
http://www.tomshardware.com/ is the best place to look around on.
I'd suggest going 8gb of ram, 1tb (i have 500gb and I havn't gotten close to halfway), and of course the 3year extended warranty.
All of that DSO offers, plus a variety of options that let you add or take off shit you dont want (TV tuner, accessories).
Look at the website for laptops and play with the options.