Does 512mb of vram help with external displays?

I'll be buying a MBP soon and was wondering if the additional vram in the 2.5 15" version will be of benefit to me compared to the 256mb of vram in the 2.4 MBP...anyone know?...I'll be attaching to a 23" monitor, maybe Apple, maybe NEC...maybe 24"...oh, and I won't be using it for games...only work...
I am thinking the additional L2 cache in the 2.5 version might make a difference in how agile my computer is working on photoshop files...that's my most used program and probably most power hungry...i don't work on film/video, music, etc...just design and photography...Photoshop/Illustrator/Indesign/Lightroom...
the only other thing i do that seems to bog down my current computer is making backup dvd's of films I buy...that just takes forever...sometimes over 2 hours...
thanks...

thanks tthiel1...I'm thinking to buy the base model...2.4...save myself about five hundred bucks...the 2.5 is tempting but I don't think it'll make a real world difference for the type of work i do...i watched a salesman playing with a 2.4 hooked up to a 23" monitor yesterday...very impressive...amazing that a portable can be so powerful...and man, the color on the 23" was very nice...
kind regards...

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    0x304faf28 : 0xeabdb8 (0x533c804 0x3d0900 0x304faf74 0x0)
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    com.apple.driver.AppleACPIPlatform 1.2.5
    com.apple.iokit.IOPCIFamily 2.6
    com.apple.iokit.IOACPIFamily 1.2.0
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