Optimum processor speed for Logic 8

Hello out there! I want to buy a desktop computer to run Logic 8. I want to be able to use Stylux RMX, Vienna Special Edition, and probably other soft synth like Spectrasonics Atmosphere in Logic and also to record some audio (vocals, keys) into. I was wondering what is the most critical element(s) in a desktop that I should be aware of? I understand that the more RAM the better, what about the processor speed? I have even heard that the graphic card also has an important role in the performance; is this true?
will a loaded iMac desktop do the trick or is it absolutely necessary to go for the Mac Pro?
please help!

A loaded iMac will more than do the trick for most people - just max out the RAM. However, it is usually recommended to go w/ the best you can afford. . . so if you can afford one of the powerful 8 cores, than go for it. You'll get better performance and more expandability if you are looking to go into this professionally.
However, if this is more a hobby or a side thing, I'd suggest saving the money and going for the iMac. Its all in one, and the dual core can handle more than most can throw at it. With about 4 gigs of RAM, you should be set.

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