Getting Windows Vs. Mac

If you want to buy a windows laptop, you will have to decide
Dell/HP/SONY……….which one………………..
And then
Windows Vista/Windows XP/………….
And then
LATITUDE/INSIPRON/…….
CONFIGURATION…………………………………………………………………………

Now if you getting a MAC
MACBOOK/MACBOOKPRO..

And the cost difference between them ? for the same hardware configuration 0$