GMA950<->CoreDuo-the bottleneck in laptop for 2D GRAPHICS

How you doing, I need to buy a custom laptop for work at the university next week. I will be dealing with such tasks:
mostly 2D graphics (Photoshop, Corel Draw, large raster files .tif .jpg ~100MB like map scans etc.). Also some GIS (GeoMedia, ArcView....) and from time to time landscape visualization (3D Nature's SketchUp,Microstation or simple AutoCAD tasks,3dMax and so on). Plus Ms Office and web browsing. For graphics this laptop will have an integrated Intel's GMA 950 chipset only (anyways, I am not planning to make a professional graphics station out of a 15" econo laptop). The components I can choose are RAM and CPU. What is the optimum configuration, is there a reason to put the newest C2D into it? Or it won't make any difference because the Intel 950 will be 'the weakest link', the bottleneck slowing everything down?? I don't need to play games and I don't care about future 64-bit applications. I searched this forum and the internet for awhile but didn't find any interesting answer..here are some possibilities:

Core Duo T2500 (2MB L2 2.00GHz)
1024 RAM
Intel GMA950

Core 2 Duo T7200 (4MB L2 2.00GHz)
1024MB RAM
Intel GMA950

Core 2 Duo T5500 (2MB L2 1.66GHz)
1024MB RAM
Intel GMA950

Core Duo T2700 (2MB L2 2.33GHz)
1024 RAM
Intel GMA950

which configuration is better? what's the most important in 2d graphics, apart from 1 or 2GB ram memory: CPU's cache,clock speed or maybe sth else? thanks for any support on this

 

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