Lag Issues since RAM and HD Upgrade

Hi all,
About a month ago I finally ran out of space on my 2007 MBP (2.2ghz). After much research, shopping, etc. I upgraded to 2x2GB Corsair RAM and the Western Digital 500gb Scorpio Blue hard drive.
RAM installation went smooth, no apparent issues.
Then the HD replacement followed a day or two later (just so I was sure the RAM was OK). Opening up the case was daunting, but seemed fine. Clean install of Tiger from the disks, and everything boots up great!
But....now I have lag. No clicking or audible hard drive parking as some have experienced, just a little delay that is inconsistent and across functions (i.e. typing, load new tab in Safari, CMD-TAB to switch applications). Sometimes beach ball, sometimes not.
I have checked all things posted in various forums - repaired permissions, smc and pram resets, and have used Disk Utility, Onyx and TechTool Deluxe (I'm still under Apple Care). The result is less lag, but lag nonetheless.
After booting to my old drive (external and left untouched since the upgrade), guess what? NO LAG!
Can anyone comment / help on the possible issues here? As I see it, here's the possible conclusions I've narrowed it down to:
1. This particular WD is (a bit) faulty. Exchange it assuming WD Scorpio Blues are compatible?
OR, can anyone suggest an HD that is more likely to work without issue?
2. Apple firmware is simply not 100% compatible with 3rd party drives - just need to hope they address this?
3. Tiger is the problem? Move to Snow Leopard and issues will disappear?
4. Insert your theory here.
Thanks!
Kevin
Message was edited by: Kevin Schultz

Just thought I would chime in here,
I am in exactly the same situation as yourself after installing a WD 500GB HD (Model: WD5000BEVT). I have also tried the "hdapm" application but after a lot of effort just couldn't get it to work. I am currently waiting for a response from WD as this seems like a common issue and should hear back from them by the end of today. Just to make sure we have the same thing here are the symptoms from my computer:
- Very brief lag (1 - 2secs) on most things. For example, right click on an item to bring up a menu will result in spinning wheel for a few moments and then the menu.
- At time of lag/freeze a noticeable sound of the HD spinning up before the action will be performed
- Computer boot up and shutdown time seems seem longer than with pervious "official" HD
- I also noticed when I was transferring all my music (43GB) onto the computer the computers responsiveness while using applications was much faster.
Whilst here, does anyone know which HD is the official 500GB 2.5inch SATA drive that apple uses and if apple themselves modify the firmware to make it work better with there notebooks. I would just be interested to know and if it comes to it I will put this current HD into something else and get a more compatible HD.
When I hear back from WD I will post what they said.
Regards.

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Message was edited by: eatrese
Message was edited by: eatrese

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The statement that the apple web article is from 2004, and is therefore invalid, might work for some people on an emotional level, but not to a lawyer. Apple is wearing a big red bullseye on their back for as long as it remains up on the website.
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