hi im thinking about getting a new internal harddrive. i have a macbook 2,1 intel. it currently has a 80 gb harddrive and i have 38 gb left! would getting a bigger harddive increase performance? http://www.macupgrades.co.uk/store/machine.php?name=macbook should i buy Seagate Momentus or Western Digital? and would a 7200RPM make my laptop run any faster? thanks!