Hi, I've been in the hunt for the fastest cheapest lightest doesn't overheat laptop for the past few months. As we speak I am trying out laptop #6, #5 is in the corner, and I'm sending #4 back today.
Here's what I've learned.
You do not what the Core 2 Duo.
You must get one of the new intel chips.
The best intel chips are either i5 or i7. The difference between the i5 and i7 is hyperthreading. If you are going to use software that requires the use of a lot of threads at one time, you have to get an i7 720 or higher.
The biggest downside of i7 720 chips and higher is they use a lot of memory and energy.
The other downside is since most software apps don't need more than one or two threads to operate, the i7 720 chip and higher will generally operate at it's minimum ghz and not their turbo boost speeds. The i7 720's minimum is 1.60ghz. an 820 chip will go at 1.73ghz. The 920 is 2.0.
On the other hand the i5 540 runs at 2.53ghz, the i7 620 at 2.66gz.
I generally have foxfire open with at least 10 to 12 tabs, my web design program, a wed editor, a few games, excel, word, skype, sobees, photoshop, ftp program, and my live stream site open at the same time.
I found I did not need hyper threading. The i7 620 is doing an amazing job. You need at least a 4mb cache. I also have 6mb of memory at 1333mhz and a 500 gb hard drive at 7200 rpm.
As long as I'm talking, let me suggest some laptops for you. I tried Toshiba, Vaio, Lenova, and HP. Oh and Dell. All went back. I believe the two best laptops for value are Sager 8690 and Micro Express nbl50. Former with my configuration is about 400 dollars more than the Micro Express due to the warranty and the keypad. Check them both out. Good luck.