Which laptop? - t6600 vs core i3-330m vs p8600

Hi all! I'm from India & I need some help in deciding which laptop will be most suitable for using Photoshop, Illustrator, Dreamweaver, Flash & related graphics apps. [maybe 3ds Max?] etc. simultaneously [read multi-tasking].

So the laptops currently under consideration are-

1. An Asus K50IJ

C2D T6600 2.2 GHz,;Operating System Dos; 4GB DDR II (2GBx2); 15.6" HD (1366x768) LED; Video Graphics & Memory - Intel; Hard Drive 320GB, 5400rpm; 2 Years Warranty

2. Another Asus model which is the same as the above with the exception of -
Proccesor: i3-330/350m; 2GB DDR II; 1 Year Warranty

3. The MSI GX620

C2D P8600 2.4GHz; 4GB Ram; 320 GB HDD; Gfo9600M GT 512MB DDR3; 15.4" WXGA(1280*800); Vista Home Premium; 2 Year Warranty.

So which of the 3 would best suit my needs? All of them are around the 31k INR [~600$ US] mark.

Would any advantage that the i3 has over the 6600 be offset by the increased RAM? Where does the p8600 fit in? Considering multi-tasking, is the i3 [4 threads?] better?

I'm not really considering the gfx card seriously, cos 2d programs would not really require it. Correct? On the other hand, the card could potentially lead to overheating & shorter battery life. Or is that just nonsense?

My thinking is that it's between whichever is the better processor and the RAM, with the warranty in the background.

TIA.

PS: I'll be using the machine for hours at a stretch [6-8 hours].