The prices:
The prices are different because of the difference specifications and operating systems including. The new laptops would be a little higher in prices than the usual ones and the secret is in Windows Vista. Look at 2 HP laptops with the same specifications and you will find that there is a difference between the prices because one comes with 'MS Windows XP Home edition' while the other one comes with 'MS Windows Vista Home Basic or Premium'. The difference would be from 500 - 800 Q.R.

Another factor is the processor, the speed and type of processor can also play a major role here.
We have currently those :
1- Centrino Mobile Technology
2- Core Duo
3- Core 2 Duo
The price would go higher as we move from Number 1 to 3 [No.1 is the cheapest]. I'm talking here about the good ones along with some AMD models. There are a lot that you can find with cheaper prices, those got Celeron, Sempron and other low cost processors.

The RAM, Hard Drive capacity and the size of the screen [usually 14, 15, 17] and Video Cards [Shared or not, don't go for the shared or what called VRAM, those would rely on your laptop RAM so if you have 512 MB and your Video Card was 64 MB, then the actual RAM that you have would be 512-64=448 and so on] can also play a role here in determining the prices of your laptop.

I am impressed, King Edshel.
I was thinking of an Acer but now I am convinced that it's not a good choice. My budget is around QR. 3600. What HP are you recommend and at which shop.

Thank you