Core i3 (2.13 GHz) vs P8700 (2.53 GHz)

I'm currently trying to decide between the Dell Studio 14z, Dell Studio 14, and possibly a Toshiba Satellite M500. I need a laptop capable of smoothly running GFX apps like Photoshop, older games (Halo 1, NFSMW, etc ), and possibly AutoCAD software. Which option below would be a better choice?

Dell Studio 14z - $724
Core 2 Duo P8700 (2.53 GHz)
NVIDIA GeForce 9400M 256MB

Dell Studio 14 - $759
Core i3 (2.13 GHz)
ATI Mobility Radeon HD4530 512MB

Toshiba Satellite M500 - $794
Core i3 (2.13 GHz)
NVIDIA GeForce 310M 512MB

I can't really provide links because all 3 were custom made using the manufacturers' websites, and I think the pages expire after a few minutes.

All three have the same specs except for CPU and GPU (I decided to get 3GB RAM on all of them so that's no longer an issue.)

Below $800

EDIT: I'm really leaning toward the ASUS UL30Vt-A1 rather than the other 3 laptops I mentioned before. Despite having a Core 2 Duo 1.3 GHz (overclocked to 1.7 GHz), it also has 4GB RAM (vs 3GB), 500GB HDD (vs 250GB), NVIDIA GeForce 210M 512MB, excellent battery life (7+ hrs), is thinner and lighter, and I've read that it runs relatively new games such as Bioshock, Mass Effect, and Fallout 3 just fine; all for $764. :)