I was recently asked this by my friend who is not a power user.
1. Good CPU, i5 or higher!
2. Good Video card, NOT shared memory, if you go for low end on this it will hurt you for the life of the notebook
3. Lots of storage, don't cheap out on the hard disk, there cheap so no reason.
4. Go 17" so you get two hard drive bays and can dedicate one to a boot SSD
5. Good Memory! If the memory isn't high quality turn away and run!
6. Good Wifi chipset, don't screw around with anyone that basically isn't boardcom, you want open drivers
Basically follow my rules and you'll end up with a good notebook. You don't have to be a power user to actually make use of high quality / good parts. The worst thing most notebook buyers do is go out and buy what they can get by with right now. If your going with the cheap option you better be prepared to suffer for the few years a head.