If you are serious about photo editing, IMO stay away from laptops as you'll want a nice big bright screen suited to photo editing.Most laptop screens won't cut it.
http://www.eizo.com/ is the cadillac (or one of them) of monitors.
Mac VS PC - not touching that one, it's personal preference - macs are more expensive and have less software choices but many people find them more intuitive. But at this point either platform can do almost every task really well.
You'll need a decent graphics card (not necessarily the best)
I'd recommend Minimum 4 GB Ram.
If you are a rookie to photography, I would not recommend starting with the best package unless money is no object. I say this because passion fades fast and there is a learning curve to all this. Not everyone that takes up photography (or many things actually) sticks with it. We DO encourage you to stick with it though because it's a GREAT time to be into photography.
Hope that helps - marko
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