Laptop for Photos

Can anyone tell me what is the best laptop for working with photos and photo software? I need it to have a good amount of memory and speed, but I can't spend a lot of money. For instance, APPLE products tend to be too expensive. I am not against getting a refurbished laptop.
 
Casual graphic editing works well enough in modern systems, just get a good processor (~3ghz) and lots of memory.
Professional use (24/7 production) belongs on a desktop system with a good graphics card.
 
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