Advice on Macbook pro 13 inch hard drive replacement !

Hi, i just replaced my macbook pro 13 inch hard drive which was a fujitsu 320gb 5400 rpm, replaced for a Western Digital 500gb 5400 rpm (wd5000bevt).

I am noticing this drive to be a little laggy every once in while it lags for 1 or 2 seconds, its really getting on my nerves, i read some other forums and it said to disable de sudden motion sensor which i did, i also follow this tutorial about the HDAPM ( http://mymacfixes.blogspot.com/2009/...from-hard.html ). But i still feel my drive been a litte laggy sometime and getting the beachball every once in a while doing easy tasks like just surfing the web.

I might change my hard drive for a Hitachi 0A57915:

TigerDirect.com 404 Error - Page Not Found

Will this other hard drive solve this issue and having my macbook pro as good as with the old drive but with more space capacity?

here is another hard drive option its a Seagate Momentus ST9500325AS:

TigerDirect.com 404 Error - Page Not Found

One more thing, can i also upgrade to a drive bigger than 500gb ? maybe 640gb, and what about 7200 rpm ?

please help im going crazy with this problem people

any help please

http://www.newegg.com/Product/Product.aspx?Item=N82E16822148591

ur links dont work btw

EDIT:fixed the link

what is that link, im looking for 2.5" not 3.5"

yeah i put the wrong one at first i fixed it though try it now

Here is the link for Hitachi 0A57915

Hitachi 0A57915 Travelstar 5K500.B Mobile Hard Drive - 500GB, 2.5 SATA, 5400rpm, 8MB at TigerDirect.com

and Seagate Momentus ST9500325AS:

Seagate Momentus 5400.6 ST9500325AS Mobile Hard Drive - 500GB, 2.5, 5400RPM, 8MB, SATA-300, OEM at TigerDirect.com

will there be a significant change if using a 7200rpm drive like hitachi or seagate instead of 5400rpm? regarding battery life, noise, and vibrance?

5400rpm vs 7200rpm

I have a 13 inch macbook pro, what will be the effects on 7200 agains 5200 rpm. Regarding battery life, vibrance, noise, etc. ?

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5400rpm HD vs 7200rpm HD - Google Search

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