Why do you want a normal keyboard? The keyboards on MacBooks are already really good, better than standard keyboards.
Same goes for the screen… unless you're buying an expensive monitor, it won't look better than the LCD on a Mac notebook.
I don't know the kind of screens you were getting, of course, but it seems this is your first Mac machine so I just wanted to give a heads-up of the quality you'll be missing out on if you replace the keyboard and screen. I personally have dual monitors; I use my PowerBook screen with another LCD screen, but this LCD screen, even though it's bigger, is a joke next to my PowerBook's screen.