As a Switcher... I would tell you to go for what you need. The Dual Core 2, processor is extrememly fast and 64 bit... In English this means that when Leopard comes out and say Photoshop CS3... Comes out... If they write the code for 64 bit like most programs will be... because Windows Vista is a transition operating system... (32/64bit capable...) You will see speed improvements on those programs.
Maxing out the memory on any Mac computer is recommend because it enchanes the speed and quality of the product...
If your going to do alot of graphics design, Web design, Movie Making, I recommend Maxing out the Video memory...
Just have fun and enjoy it... Also remember you can Use BootCamp, to install Windows XP... So its the best of Both Worlds... Thats Why I got an IMAC... 
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Ibook 14'' Tiger 10.4.8(And Updates for the Future etc.) 1Ghz, 768mb RAM, 40GB HD, Airport Extreme Card.
& My baby
Intel-IMac 20" Tiger 10.4.8(And Updates for the Future etc.) Duo 2 Ghz, 2gb RAM, 250GB HD, Airport Extreme, Bluetooth... BootCamp Windows XP Home
It does what I need it to do in a simplified yet complex environment.
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