Welcome to the forums :)
OK. I just had a brief listen to the iTunes preview of Magnets. I'd check out all the channel strip settings in Logic 8! There are a lot to go through - but I'm sure you can find something that will get close - with the buzzy synth.
It sounds very processed... with chorus - it's been compressed - just a little...!
In the break down, there's a organ esq sound. Is that what you're interested in?
I'd really recommend spending time going through the CSS and Plug-in presets and the apple loops - especially check out the green apple loops.
Get to know Logic first. It will help you in the long run. I can't recommend the Logic 101 tut enough:
405 minutes and you'll be able to find your way around Logic much better.
However, be aware that you're really asking about the Instruments and plug-ins, so some knowledge of synthesis would be helpful in this case.
Now, I don't want to keep recommending you tutorials... but Steve H. has created a great one on the ES2. Once you know how to use this synth then you can more easily figure your way around Logic's other Oscillator based synths.
But, if you wanna get down and make that sound - well, open up the ES1 and check ou the CSS and presets and get tweaking :)
Also, try to replicate the elements of the sound and bear in mind that you can add the gloss and depth to the sound later using insert plug-ins (delay, reverb, chorus, compressions etc).
Hope that helps,